DOF

...
The only weight and price difference you will see is in the entry
level body and lens lines; even then things are marginal at best and
given lack of consumer demand, ppl just dont care.
You are right that with Super High Grade lenses attached, there is no cost or weight advantage. However, with the High Grade lenses (e.g., the 12-60 and the 50-200) on the E-3, I believe that FT still maintains its cost and weight advantage over FF. And that kit is not entry level.

Jeff
 
I don't think the deep depth of field from small-sensor cameras
matches "real life". Our eyes need to continually re-focus in order
to view objects at different distances.
In fact, as our attention is centred on a specific point, our eyes
focus at that distance too. Thus there is a combination of optical
and psychological focussing involved.
It could be argued that a photograph with shallow depth of field is a
better representation of reality because it is using the technique to
give the psychological focus which might otherwise be lacking.
Regards,
Peter
Well I should of made the caveat 'perceived real life'

I'm aware that our eyes continually scan scenes and our brains make up a realistic picture.

In fact our eyes are pretty noisy too, I remember once someone lamenting the noise in the sky in one of my pictures "look at the sky, real life sky is clear cyan not grainy"

I spent the next while looking at sky, and you know what they look grainy to me ;-)

I guess our eyes aren't as good as our cameras, still most people perceive our eyes are low noise wide DR, large DOF devices and that has come to be 'real life' for the majority.
Mark
--
http://www.photo-utopia.blogspot.com/
 
The shallow DOF is just another artefact of imperfect optical
systems. Sure, masters are able to create great art in spite of it,
or even use it to their advantage.
How is shallow DOF "just another artifact of imperfect optical
systems"? What would a "perfect optical system" deliver?
I mean that optical image-capture systems have numerous limitations. There are images no lens can capture. Have you ever seen a photograph in isometric projection (where objects don't grow smaller with distance)?
I think it's an often-abused special effect. Useful or "sucks",
depends on what the photographer wants to capture.
In my opinion, it is less "abused" than used so that people can keep
a low ISO in low light.
In which case, shallow DOF becomes a (necessary) evil. Or, when I'm taking a head-shot of my six-month-old son, I have to either stop down to 4.5, shoot from dead-on-frontal direction, or try and use shadows to hide the fact that one of his eyes is out-of-focus. One more choice is to shoot from further away and then crop, sacrificing resolution. And that's with a 4/3 camera, using a 50mm lens!
That is, people often shoot 35mm f/1.4 ISO
400 so they won't have to shoot 35mm, f/2.8 ISO 1600 and get a more
noisy image. People are more willing to trade DOF fo less noise,
then to use a higher ISO to get a deeper DOF, regardless of the
"appropriateness" of the more shallow DOF and concomitant effects
(softer edges, increased vignetting, less sharpness).
Make it "some people", and we'll agree. There are other options: Add more light, change position, use flash, use NR, use tripod (or IS), or convert to B&W.

Boris
 
The animosity occurs when 4/3 folks claim that the larger DOF makes
their format superior... while completely ignoring that you can
freakin stop a lens down on a larger format camera (obvious, you cant
go the other way).
You do realize that that lens will have to be two stops down from a 4/3 lens, right? To match the DOF of a 50mm f:22 ISO 400 on 4/3, you'd have to be at 100mm f:45 ISO 1600. Unless it's a D3, the noise will be worse than on 4/3...

Boris
 
The animosity occurs when 4/3 folks claim that the larger DOF makes
their format superior... while completely ignoring that you can
freakin stop a lens down on a larger format camera (obvious, you cant
go the other way).
You do realize that that lens will have to be two stops down from a
4/3 lens, right?
Obviously.
To match the DOF of a 50mm f:22 ISO 400 on 4/3,
you'd have to be at 100mm f:45 ISO 1600. Unless it's a D3, the noise
will be worse than on 4/3...
No it won't. Plus, when you get all the way to diffraction-limited, you could just use 50mm and f22 on the FF camera and crop. The loss of pixels isn't particularly relevant since the limit is diffraction, not pixel count.

--
Lee Jay
(see profile for equipment)
 
The animosity occurs when 4/3 folks claim that the larger DOF makes
their format superior... while completely ignoring that you can
freakin stop a lens down on a larger format camera (obvious, you cant
go the other way).
You do realize that that lens will have to be two stops down from a
4/3 lens, right?
Obviously.
To match the DOF of a 50mm f:22 ISO 400 on 4/3,
you'd have to be at 100mm f:45 ISO 1600. Unless it's a D3, the noise
will be worse than on 4/3...
No it won't.
Yes, the noise will be worse. As you're two stops below, both sensors get the same total number of photons. Whichever sensor splits them into the smaller number of pixels, will have less noise. D3 is the only camera that has similar pixel count to current 4/3 offerings.
Plus, when you get all the way to diffraction-limited,
you could just use 50mm and f22 on the FF camera and crop. The loss
of pixels isn't particularly relevant since the limit is diffraction,
not pixel count.
An interesting idea. It would probably make sense to capture smaller files at higher f-numbers. I'd be interested to know how f-number affects resolution. Have you tried looking it up? I just did, and found this calculator:
http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Here are some interesting results:

For a 16MP 35mm camera, a 13x19 print viewed up-close is diffraction limited past f:8.

For a 10MP 4/3 camera, a 13x19 print viewed up-close is diffraction limited past f:5.6.

Apparently, the diffraction limit only depends on CoC size and f-number.
 
Both of which have an overall negative, and even disparaging view of
shallow DOF. Comments that shallow DOF on UWA is "dumb":
That's Riley. He's a lot like me, every now and then he has his
moments of extremism, but in general, he's good people.
I've seen you say that before, but I've caught him in more than one
intentional lie (not merely misinformed) and he bashes 35mm FF more
than any other single poster I know.
I'd say the poster that bashes 35mm full frame more than anyone else is Razor503.
So, our opinions will just have
to differ on this point.
k. I'm not going to try to arbitrate between two people I like. That's hard enough in person, and near impossible online.
that shallow DOF just makes things "blurry and confusing":
I think that, properly used, the shallow DOF can reduce the confusion
of a background with "unnecessary" and "compelling" detail.
That's my feeling on it. It's no more "improper" than desaturating
an image to remove the "clutter" of "distracting color".
The way black and white photographers have been doing for 150 years. Choose the right filter to emphasize or deemphazise things.

Then again, there were movements like the "f64 group" that made quite a virtue of deep DOF.
You see, I'm an ultra shallow DOF shooter:
that only occasionally shoots deep DOF:
That's the "hammer" effect. When all you've got is a hammer,
everything looks like a nail. You've made a virtue of a capability,
instead of a necessity.

I don't find either approach (making virtues out of necessities or
capabilities) to be "correct", as in the "one true way".
I see it as I have little interest in deep DOF. I mean, I've
presented enough examples of where deep DOF is not an issue for me to
pursue, but it's just not usually my pot o' tea.
Or even your "cup" of tea. ;)
When it is
"appropriate" however, I most certainly make use of it.
Exactly. One does whatever is appropriate for a particular shot.
So while I love shallow DOF, I don't disparage deep DOF shooting.
I hope you don't mind if I point out that I detect a certain bias in
your choice of words that says otherwise.
Well, I can't comment on that one way or another. I just know that I
love landscapes, where I usually (but not always) choose deep DOF
and I love candids, where I almost always prefer shallow DOF. Even
in macro, I love shallow DOF, and find most of the deep DOF macros
"clinical".
Then try the thing with the pair of 50mm f1.4 lenses....
More to the point, as I'm primarily a people shooter, I simply don't
see people pics that make what I consider "good use" of deep DOF.
Even studio portraits bore me.
I love environmental portraiture, and environmental figure work. That demands sharp deep DOF.

I can't see this one working without sharpness front to back. I'd have liked it sharper than it was. And it's not a wide angle shot, I probably shot it with a 50mm on a 1.5x crop.

[warning, nudity]
http://www.pbase.com/the_wiz/image/25666358/large.jpg

This one wouldn't work without both the broken glass and the girl in sharp focus. Again, I'd like that foreground glass sharper.

[warning, nudity]
http://www.pbase.com/the_wiz/image/5118529/original.jpg

Would this work without that wall in sharp focus?


It's merely a different style of shooting. Much in the same way that
while I love the 5D as it is the best system I can afford that
caters to my style of shooting, I don't disparage other systems that
cater to different styles of shooting. In fact, aside from studio
portraits, are there any of you who are people shooters that use deep
DOF?
I've used it outdoors against backgrounds of flowers for incredible
effect.
I'm not saying it's not possible:

Canon G2 @ 7mm, f / 5.6 (35mm, f / 27), 1/640, ISO 50

http://www.pbase.com/joemama/image/31405291

http://www.pbase.com/joemama/image/31405291/original.jpg

I'm saying that it's extremely unusual to see it done well on
anything but WA/UWA.
I'd still disagree. But isn't your example WA?
I've certainly seen deep DOF people pics, but they're almost
always UWA and, with most systems, you have little choice but to get
deep DOF with UWA.

Thus, my question: do you believe that shallow DOF sucks, or is it
simply a different style of shooting that you may, or may not, have
an interest in?
And that's the choice of language, again. You're leading us with
sarcasm.
Nope, I'm echoing the comments that I presented in the two links in
the initial post in this thread that others have cast upon shallow
DOF.
I'd have echoed them in mor positive, or at least neutral, language.

--
Rahon Klavanian 1912-2008.

Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.

Ciao! Joseph

http://www.swissarmyfork.com
 
I mean that optical image-capture systems have numerous limitations.
There are images no lens can capture.
Gotcha.
Have you ever seen a photograph in isometric projection (where objects
don't grow smaller with distance)?
In fact I haven't! Got a link? I'd love to see that!
In my opinion, it is less "abused" than used so that people can keep
a low ISO in low light.
In which case, shallow DOF becomes a (necessary) evil.
Yep. But most of the time, it's not a "necessary" evil -- it's a bad choice.
Or, when I'm taking a head-shot of my six-month-old son, I have to either
stop down to 4.5, shoot from dead-on-frontal direction, or try and use
shadows to hide the fact that one of his eyes is out-of-focus. One
more choice is to shoot from further away and then crop, sacrificing
resolution. And that's with a 4/3 camera, using a 50mm lens!
Yep -- that's exactly it! In fact, for such pics, I think compacts are usually the best tool.
That is, people often shoot 35mm f/1.4 ISO
400 so they won't have to shoot 35mm, f/2.8 ISO 1600 and get a more
noisy image. People are more willing to trade DOF fo less noise,
then to use a higher ISO to get a deeper DOF, regardless of the
"appropriateness" of the more shallow DOF and concomitant effects
(softer edges, increased vignetting, less sharpness).
Make it "some people", and we'll agree.
Aargh! I should have phrased it that way from the start! My bad! : )
There are other options: Add more light, change position, use flash, use NR,
use tripod (or IS), or convert to B&W.
You got it, sir!

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
 
Jogger wrote:
To match the DOF of a 50mm f:22 ISO 400 on 4/3,
you'd have to be at 100mm f:45 ISO 1600. Unless it's a D3, the noise
will be worse than on 4/3...
No it won't.
Yes, the noise will be worse. As you're two stops below, both
sensors get the same total number of photons. Whichever sensor
splits them into the smaller number of pixels, will have less noise.
Per-pixel. Not less noise in the overall image. Signal-to-noise ratio is what counts, detail is signal and noise is noise. Fewer pixels means less signal and less noise. More pixels means more of each. We can use software to trade more detail and more noise for less detail and less noise if we want.
D3 is the only camera that has similar pixel count to current 4/3
offerings.
12.1MP versus 12.7MP on the 5D? Not much difference.
Plus, when you get all the way to diffraction-limited,
you could just use 50mm and f22 on the FF camera and crop. The loss
of pixels isn't particularly relevant since the limit is diffraction,
not pixel count.
An interesting idea. It would probably make sense to capture smaller
files at higher f-numbers. I'd be interested to know how f-number
affects resolution. Have you tried looking it up? I just did, and
found this calculator:
http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Here are some interesting results:
For a 16MP 35mm camera, a 13x19 print viewed up-close is diffraction
limited past f:8.
For a 10MP 4/3 camera, a 13x19 print viewed up-close is diffraction
limited past f:5.6.

Apparently, the diffraction limit only depends on CoC size and f-number.
Right.

--
Lee Jay
(see profile for equipment)
 
Shooting a congress hall in low light with f4 I have a shutter speed
and a DoF that covers my needs. If I go to f8 (with a FF) I have
slower shutter speed that does not covers me. Of course the FF has
almost 2 stop advandage at ISO, but, the price goes up too.
Absolutely.
All systems have their plusses and minuses.

I still don't get it. I mean, you use f/2.8, I use f/5.6 -- where's
the advantage?
Only at shutter speed
Well, as you say above, that's taken care of with ISO.
Also, many 4/3 proponents like to say how their
lenses are "sharp wide open". OK. But "wide open" on 4/3 is nothing
like wide open on FF. Stopped down to the same DOF, FF comes out
ahead. Where's the issue in stopping down?
Correct. I'll never say something different
Excellent! We're in agreement on everything so far! : )
And to make it crystal clear , I am NOT saying 4/3 sucks.
I'm not a fanboy, so I'm not worrying. I use my gear, I know its pros
and cons and I try to do my best.
Thanks for understanding my postition!
I'm just saying that the evidence I've seen points to FF having higher IQ.
Just because I think Jessica Alba is hotter than Jennifer Lopez
doesn't mean I'm dissing Jennifer Lopez -- either will do. : )
BTW I can see you're very clear and with serious point of view
On formats, Jessical Alba and Jennifer Lopex, or both? : )
I'm just saying that I don't get how being sharper and having more
DOF at f/2.8 on 4/3 is an advantage for 4/3, when FF is at least as
sharp with the same DOF at f/5.6.
Correct too. Some people believes that is more easy for the
manufacturers to produce a (given sharpness) cheaper lens for small
sensor than a lens for FF or MF.
Here's how I see it: since the 4/3 sensor has half the dimensions of a FF sensor (more or less), the glass needs to be twice as sharp as FF glass to resolve the same number of pixels. In all the examples I've seen, the reality is that 4/3 glass does ever so slightly in the exteme corners, but worse in the center, than FF glass.

So, while it most certainly is easier and cheaper to make glass with a smaller image circle sharper than glass with a larger image circle, is it easier and cheaper to make it twice as sharp? I don't know. But I do know that to give it a max f-ratio twice as fast to get the same aperture is way more expensive than it is to get a given aperture with the same size aperture on glass with a larger image circle. Of course, if you don't need the wide aperture, then that advantage of the larger sensor is, of course, lost.
So, I think it's the money. It is impressive that the 14-42 kit lens
for olympus is an unbelievable sharp lens and it adds100$ over the
body only.
A great deal, to be sure. But, to be fair, at the same apertures, I honestly don't know how well the 28-90 on FF would pan out, and it costs the same amount.
It would make sense to me if both
we diffraction limited at the same f-ratio, but diffraction softening
also comes two stops later for FF than 4/3.
Correct too. The FF lens hole (area passes the light) is 4x than 4/3
at the same aperture
You mean "...at the same f-ratio " -- at the same aperture, the holes are, by definition, the same. : )
Have a good day
You as well! I enjoyed the discussion!

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
 
I think you're being a little naughty in your selection of
quotations. I thought both threads were on the whole quite well
balanced.
The threads themselves were balanced, but the viewpoints I quoted come up quite often. I wanted to get a broader base of viewpoints from other systems.
I'm happy for your ability to shoot very narrow DOF, and I wish my
system had more of that capability too for when I want to shoot in
that style (though in general it has been sufficient for most of what
I do).
And I wish my system had in-camera IS, so we're even. : )
I think the discussion was more around possibly the differences
between what non-photogs and photogs look for in an image, and
whether the latter are perhaps too hung up on what is just one style
of many (naturally not implying that you are ;) And of course, narrow
DOF is one way to achieve an overal artistic goal, but there are
other ways, e.g. selection of background and lighting are perhaps
more powerful and flexible, maybe not so cliched.
For sure, for sure. But, I have a huge number of clients, and they all love the pics I have in my office:

http://forums.dpreview.com/forums/read.asp?forum=1032&message=26114171

And while they're not purchasing the pics, many have commented on how they love the shallow DOF on the shallow DOF pics, and have even engaged me in discussions about it. Thus, my experience is that the "average non-photographer" does like shallow DOF. Not to mention, often the birthday presents I give are shallow DOF candids, and they have always loved them, and it doesn't appear as though they're just feigning graciousness.
When I think back to memorable photos, I find I tend not to recall
them so much for their dof, as I do the subject. This sprang to my
mind when looking through my family photos going back 10-50 years...
the interest is in the subject, not how the photographer rendered the
DOF.
For sure, the subject is key. But the rendering of the subject is also key, just not as key.
So the debate was, I think, more around why someone might like, or
buy a photo. And generaly, I believe, it is not so much around the
artistic merits of the photo, but because the subject, the person or
the landscape, has meaning for them. If it is rendered artistically,
then so much the better, but that is not always the prime driver. I
think we as enthusiasts, tend to overestimate the publics' interest
in our craft.
I would present Ansel Adams photos as counterexample. It was every bit how much he rendered the subject, as it was the subject itself, that gave the photos the impact they have.
So, in summary, I'd agree that control of DOF is a very nice thing to
have, but it is not the only consideration in selecting a system, and
many other factors, including portability, should play their part.
Sorry if I ever even implied the contrary! I'm just saying that shallow DOF is but a tool at one's disposal, and don't understand all the attacks it has taken.

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
 
1. Given available lenses, you can get shallower DOF with a FF camera
than with a FT (or APS) camera. A FF camera will also have better DR
and high-ISO IQ.
Yes.
2. A FF kit is heavier and more expensive.
Not always for the same DOF/light gathering ability. Often, the FF kit is lighter and less expensive under those conditions. But, if reach is the only consideration, then yes.
3. Some people either can't afford FF, or don't believe the
advantages of FF are worth the price and weight. Others believe that
they are.
Yes.
4. In addition to lower cost and system weight, Olympus FT cameras
have other qualities that appeal to people: weather sealing, in-body
IS, the lenses, dust removal, articulating LV LCD, etc.
Absolutely. Please take a read:

http://www.josephjamesphotography.com/equivalence/#Q&A

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
 
Its a nice summary and mostly right. But I think you are ignoring a bit, which could be an disadvantage for 35mmFF.

Your DOF part only explains or better mainly explains the narrow DOF part. What about the other side Crop F:5 equals what in 35mmF and what you could gain with a crop. This part is cut down to absolutely minimum.

The other thing you are ignoring as well is shutter speed advantage/disadvantage of crop/35mm when doing wildlife sport photography and even AL photography. Lets say F5 on a Crop at ISO 800 or even 1600 is on 35mmFF what and whats the impact. That part is missing as well.

Other than that it a good guide.

B
--
iThink, therefore iMac
 
Its a nice summary and mostly right. But I think you are ignoring a
bit, which could be an disadvantage for 35mmFF.

Your DOF part only explains or better mainly explains the narrow DOF
part. What about the other side Crop F:5 equals what in 35mmF and
what you could gain with a crop. This part is cut down to absolutely
minimum.
I'm not sure what you mean here. I mean, I give an example with crop in the Q&A section here:

http://www.josephjamesphotography.com/equivalence/#Q&A

"Q: Won't larger sensors suffer diffraction softening earlier than smaller sensors since they have to stop down for the same DOF?

A: No. The effects of diffraction softening, just as focal length and DOF, are proportional to the FM (ratio of sensor diagonals). For example, if 4/3 is diffraction limited at f/8, then 1.6x will be diffraction limited at f/10, and 35mm FF will be diffraction limited at f/16."

and also in the Definition of Equivalence here:

http://www.josephjamesphotography.com/equivalence/#equivalence

"The following settings will be equivalent (rounded to the nearest 1/3 of a stop):

1) 5D at 80mm, f/8, 1/200, ISO 400
2) D300 at 53mm, f/5, 1/200, ISO 160
3) 40D at 50mm, f/5, 1/200, ISO 160
4) E3 at 40mm, f/4, 1/200, ISO 100"

In addition, there are many other examples throughout the essay.
The other thing you are ignoring as well is shutter speed
advantage/disadvantage of crop/35mm when doing wildlife sport
photography and even AL photography. Lets say F5 on a Crop at ISO 800
or even 1600 is on 35mmFF what and whats the impact. That part is
missing as well.


Other than that it a good guide.
Again, I'm not seeing it. As shutter speed is a fundamental in the definition of equivalence:

"Equivalent images are images from two different cameras that look as similar as they possibly can. It is critical to note that "equivalent" does not mean 'equal' -- I cannot stress this point enough. The definition of 'equivalent images' is as follows:

1) Same perspective (subject-camera distance)
2) Same FOV (field of view / framing)
3) Same DOF (depth of field) / aperture (aperture = focal length / f-ratio)
4) Same shutter speed
5) Same output size (same number of pixels / display size)"

I don't see where I'm ignoring it. If you could direct me to that section and quote, I'd appreciate it, so I could correct it.

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
 
4. In addition to lower cost and system weight, Olympus FT cameras
have other qualities that appeal to people: weather sealing, in-body
IS, the lenses, dust removal, articulating LV LCD, etc.
Spec out an E3 + 35-100 in size and weight.. and you will see there
is no savings in weight or costs compared to a 5D + 70-200 F4.
5D costs $2500, E3 $1800: favor: E3
In addition, the E3 is a full blown pro DSLR.

35-100 Vs 70-200: favor 70-200, though it is is two stops slower and is not > weatherproof as is the 35-100, though a pro would find the pro specs of the > E3, to include the 115% superbright E3 viewfinder and weatherproofing more desireable.
Addditionally, total "costs" become relative to the intended use of both "kits".
It
will probably be cheaper to purchase the 5Dmk2 + 70-200 F4 as well
(given the price for the 35-100).
To a pro, the price of the 35-100 is insignificant in that we pros are and do depreciate (amortize) our pro purchases. At the end of amortization, my 35-100 will end up costing me Zip-zilch-nada.

But to a "Joe Sixpack", perhaps the cost of a 35-100 might hurt: to a pro, it's merely the cost of doing business.
E3 + 14-35 + battery grip is heavier than a D3 + 24-70.. the Oly
14-35 is also much more expensive for some reason
The Olympus 14-35 (28-70 EFL) f/2 is one stop faster than the "normal" 28-70 f/2.8 "pro" lens, the one stop accounting for some of the difference, its weathersealing another.
The E3 battery grip is intergral.
and is not as wide.
?

E3: pro, weathersealed body. D3?
The Oly 7-14 F4 is about the same size and weight as the 14-24 F2.8
despite being a slower lens. It was also $2600 when first launched.
? ?? You keep making such transparent invidious comparisons but to what end?
E3 is about the same size and weight as D300.. why? makes no sense.
E3= Full blown, fully weathersealed body for one; certainly that makes "sense"?
The only weight and price difference you will see is in the entry
level body and lens lines; even then things are marginal at best and
given lack of consumer demand, ppl just dont care.
"ppl" like yourself?

You go from denigrating the E3 pro body to gratuitously bashing Olympus E4xx & E5xx two-lens kits: to what end?

You do know Olympus E4xx and E5xx bodies and lens kits are the least expensive DSLR+ two-lens kit out there: right? You do know that-right?
That they are $200-$300 less than any comparable introductory two lens kits;
wait: no one else except Olympus offers under $800 two-lens kits:
what was I thinking of?
 
...
I spent the next while looking at sky, and you know what they look
grainy to me ;-)
...
You know that you are in trouble when you find yourself pixel peeping the real world :-)

Jeff
 
Its a nice summary and mostly right. But I think you are ignoring a
bit, which could be an disadvantage for 35mmFF.

Your DOF part only explains or better mainly explains the narrow DOF
part. What about the other side Crop F:5 equals what in 35mmF and
what you could gain with a crop. This part is cut down to absolutely
minimum.
I'm not sure what you mean here. I mean, I give and example with
crop in the Q&A section here:

http://www.josephjamesphotography.com/equivalence/#Q&A

"Q: Won't larger sensors suffer diffraction softening earlier than
smaller sensors since they have to stop down for the same DOF?

A: No. The effects of diffraction softening, just as focal length
and DOF, are proportional to the FM (ratio of sensor diagonals). For
example, if 4/3 is diffraction limited at f/8, then 1.6x will be
diffraction limited at f/10, and 35mm FF will be diffraction limited
at f/16."
The Diffraction is limited theoretical at F8. Just to quote Wrotniak here.

"Diffraction with the 50mmF2 and 8MP starts at F12 and is really visible from F16 on." Basically the diffraction starts a little later in F Terms(goes for every system)

But thats a really minor point....
and also in the Definition of Equivalence here:

http://www.josephjamesphotography.com/equivalence/#equivalence

"The following settings will be equivalent (rounded to the nearest
1/3 of a stop):

1) 5D at 80mm, f/8, 1/200, ISO 400
2) D300 at 53mm, f/5, 1/200, ISO 160
3) 40D at 50mm, f/5, 1/200, ISO 160
4) E3 at 40mm, f/4, 1/200, ISO 100"

And there are many other examples throughout the essay.
The point is that you are using ISO 200. This makes the whole thing looks simple and gives an easy homerun. Do the the same thing with IS0800/ISO 1600 and lets say F5 for the Crop side. The whole point will change.
The other thing you are ignoring as well is shutter speed
advantage/disadvantage of crop/35mm when doing wildlife sport
photography and even AL photography. Lets say F5 on a Crop at ISO 800
or even 1600 is on 35mmFF what and whats the impact. That part is
missing as well.


Other than that it a good guide.
Again, I'm not seeing it. As shutter speed is a fundamental in the
definition of equivalence:
Exactly, but Shutter speed can be a or the main selling point like DOF. So it has to be counted in the same way as DOF and not less.
"Equivalent images are images from two different cameras that look as
similar as they possibly can. It is critical to note that
"equivalent" does not mean "equal" -- I cannot stress this point
enough. The definition of "equivalent images" is as follows:

1) Same perspective (subject-camera distance)
2) Same FOV (field of view / framing)
3) Same DOF (depth of field) / aperture (aperture = focal length /
f-ratio)
4) Same shutter speed
5) Same output size (same number of pixels / display size)"

I don't see where I'm ignoring it. If you could direct me to that
section and quote, I'd appreciate it, so I could correct it.

--
--joe

http://www.josephjamesphotography.com
http://www.pbase.com/joemama/
I'm not saying your are ignoring the fact. You are just keeping the bad side for 35mmFF and the good side of Crop regarding shutterspeed and DOF as a minor
side, which in my point of view isn't. It can be a deciding point.

One other thing: You are quoting as well " ...buying a 35mmFF body .. lets say a D3 and using a slow F5.6 lens (to be equivalent) ...". No one who would be seriously considering a ProBody ( or 35mm body )like the D3 would buy those aweful lenses. This would be a waste of money. The the Equivalence/Price/Size/Weight Effect is in practical and realistic terms even worse then your example.

But as I said before, everything else is fine. No question about that.

--
iThink, therefore iMac
 
One of reasons that I went with 4/3 is the larger DoF.
But 4/3 doesn't have a larger DOF.
Huh? According to every word that spilleth out of the mouths of other DSLR owners, the 4/3rds sensor, because of its size, most definitely has an advantage vis-à-vis DOF. You cannot have it both ways.
Whatever DOF 4/3 can do, FF can
do.
Which belies your earlier protestation that 4/3rds does not have an advantage.
Now, please don't misinterpret -- I'm not saying > this to lord FF
over 4/3. Not at all.
Yah, you are.

Worse, you, like most who own any DSLR except 4/3rds, falsely claim for your 1.3, 1.5, 1.6 "crop" DSLRs attributes which could only possibly belong to supposed/alleged "FF" DSLRs, the numbers of which total what: 3?

The rest of you DSLRers all have your own version of a crippling "crop factor" in your DSLR cameras, crippling factors which you and others who bash 4/3rds always conveniently forget to mention.
If you don't need the advantages of FF, or
the advantages of FF aren't worth the sacrifices, then don't get it.
I'm just saying that whatever advantages 4/3 has > over FF, deep DOF
isn't one of them.
? ?? So are you saying, empirically, that 4/3rds actually does have some advantages?
 
Both of which have an overall negative, and even disparaging view of
shallow DOF. Comments that shallow DOF on UWA is "dumb":
Thus, my question: do you believe that shallow DOF sucks, or is it
simply a different style of shooting that you may, or may not, have
an interest in?
Sometimes you have to manufacture the DOF, other times simply
selecting your background does the trick.

http://flickr.com/photos/11337445@N08/1815540306/in/set-72157602824510072?edited=1

In this instance, the mirror ball was shot at f/2.8, the background
being a partly snow-covered evergreen tree in the background. Had the
ball been a person, their eyes, nose and little else would have been
in focus.
FYI: The mirror ball image was shot with my DMC-FZ20 "superzoom" and it's tiny-tiny sensor.

The image belies all the frequent protests that say "small sensors on P&S cameras don't have shallow DOF; only “FF” DSLRs can control DOF".

Depth of field (DOF) is merely a tool in the hands of those who know how to use the proper compostional techniques to manage DOF per the mirror ball.
 
Nice job! - It's interesting how "photographic" the painting immediately looks and how the message of the picture is largely lost with the out of focus background.

Good deep DOF photos require more work and imagination from the photographer because the different elements have to be organized and put into context more carefully.
 

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