multiply by 1.5 on lenses

[Michael Paul DiOrio]

Hi folks

I'm just wondering if people are remembering to multiply the focal length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.

I think it's more important to remember that when dealing with wide angles. There's a big difference in the look of a picture taken with a 24mm lens on a film camera and a 24 mm lens on a digital camera. The chip size on the digital camera basically makes it a 35mm lens.
just a tthought.
Michael DiOrio

 

[Daz_Genetic]

The sensor size doesn't change the focal length of the lens at all. It is just the Field of View that is affected. The 1.5 rule only applies when talking about 35mm equivelant, but for those who have made a total change to digital, you don't need to do any multiplication. An 18mm lens is an 18mm lens no matter what size sensor it falls onto.

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[jammerbirdi]

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

this is just confusing the heck out of me.

I have the kit lens. It has marks inticating the focal length on the lens barrel. when I set the focal length to 35mm I look through the lens I see a standard 35mm wide angle view not a 50mm normal view. when I snap the image the image I get is a 35mm wide image and not a 50mm normal shot. Where's the 1:5 conversion with teh kit lens?

The shot info in camera and in nikon view gives the focal length at the time of the shot as 35mm etc.

You say that a 24mm is still a 24mm and that this is only a depth of field issue.

But the camera's manual it describes the difference and makes no mention, as I can recall, of depth of field.

What's the deal?

Question.

Is the kit lens then somehow different from say a prime in that the conversion has been addressed specifically for the D70 with the marking on the lens etc.?

Because with the kit lens 35mm is 35mm.

Or I'm a monkey's uncle.

 

[THomasAdams]

He is just stating that any lens of any focal length is still the same, a 25mm is still a 25mm. as any alterations made are due to the CCD sensor, and the 1.5 crop factor.

A photo taken on a 35mm film camera using a 25 mm lens of a landscape, in Dslr terms with a 1.5 crop factor would require a 17mm lens (25.5mm after the 1.5X crop factor) approx to obtain the same overall area captured of the landscape.

Hope this helps,
Thomas

--
http://www.280dgamingclan.com/ThomasAdams/gallery/

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

this is just confusing the heck out of me.

I have the kit lens. It has marks inticating the focal length on
the lens barrel. when I set the focal length to 35mm I look through
the lens I see a standard 35mm wide angle view not a 50mm normal
view. when I snap the image the image I get is a 35mm wide image
and not a 50mm normal shot. Where's the 1:5 conversion with teh
kit lens?

The shot info in camera and in nikon view gives the focal length at
the time of the shot as 35mm etc.

You say that a 24mm is still a 24mm and that this is only a depth
of field issue.

But the camera's manual it describes the difference and makes no
mention, as I can recall, of depth of field.

What's the deal?

Question.

Is the kit lens then somehow different from say a prime in that the
conversion has been addressed specifically for the D70 with the
marking on the lens etc.?

Because with the kit lens 35mm is 35mm.

Or I'm a monkey's uncle.

 

[John Tangney]

Sorry jammerbirdi, but I think you are painting yourself as a monkey's uncle! When the kit lins is set on 18mm, you are seeing the 'Field of View' of a 27mm lens on a 35mm camera! What you are actually seeing is the

18mm image cropped so that you only see the portion that would be covered by a 27mm lens on a 35mm camera. At the 70mm end, the image shown is the same as my 70-200 shows on the D70, and the 70-200 is not a DX lens, so it is not calibrated any differently! If you don't believe any of this, go down to your local camera store and try a 28mm lens on a 35mm camera, and compare the image to that of your kit lens at 18mm on your D70.

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

this is just confusing the heck out of me.

I have the kit lens. It has marks inticating the focal length on
the lens barrel. when I set the focal length to 35mm I look through
the lens I see a standard 35mm wide angle view not a 50mm normal
view. when I snap the image the image I get is a 35mm wide image
and not a 50mm normal shot. Where's the 1:5 conversion with teh
kit lens?

The shot info in camera and in nikon view gives the focal length at
the time of the shot as 35mm etc.

You say that a 24mm is still a 24mm and that this is only a depth
of field issue.

But the camera's manual it describes the difference and makes no
mention, as I can recall, of depth of field.

What's the deal?

Question.

Is the kit lens then somehow different from say a prime in that the
conversion has been addressed specifically for the D70 with the
marking on the lens etc.?

Because with the kit lens 35mm is 35mm.

Or I'm a monkey's uncle.

--
http://www.pbase.com/jctangney

 

[THomasAdams]

Also in regards to the kit lense, I believe the difference is that the actual optics of the lens are nearer to the CCD than that of a 35mm film lens.

A photo taken on a 35mm film camera using a 25 mm lens of a
landscape, in Dslr terms with a 1.5 crop factor would require a
17mm lens (25.5mm after the 1.5X crop factor) approx to obtain the
same overall area captured of the landscape.

Hope this helps,
Thomas

--
http://www.280dgamingclan.com/ThomasAdams/gallery/

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

this is just confusing the heck out of me.

I have the kit lens. It has marks inticating the focal length on
the lens barrel. when I set the focal length to 35mm I look through
the lens I see a standard 35mm wide angle view not a 50mm normal
view. when I snap the image the image I get is a 35mm wide image
and not a 50mm normal shot. Where's the 1:5 conversion with teh
kit lens?

The shot info in camera and in nikon view gives the focal length at
the time of the shot as 35mm etc.

You say that a 24mm is still a 24mm and that this is only a depth
of field issue.

But the camera's manual it describes the difference and makes no
mention, as I can recall, of depth of field.

What's the deal?

Question.

Is the kit lens then somehow different from say a prime in that the
conversion has been addressed specifically for the D70 with the
marking on the lens etc.?

Because with the kit lens 35mm is 35mm.

Or I'm a monkey's uncle.

--
http://www.280dgamingclan.com/ThomasAdams/gallery/

 

[BitBucket]

As others have noted, the length of the lens doesn't change, regardless of what type of camera it's attached to.

I look at it like this: A gallon of gas will move an SUV about 15 miles, but that same gallon will move a Honda Civic about 30 miles. It's still only one gallon of gas - it didn't turn into two gallons when it was poured into the Civic.

The same with film vs digital - the lens is still one length - it just acts differently on different types of cameras.

Hope this helps.

-Bob

this is just confusing the heck out of me.

I have the kit lens. It has marks inticating the focal length on
the lens barrel. when I set the focal length to 35mm I look through
the lens I see a standard 35mm wide angle view not a 50mm normal
view. when I snap the image the image I get is a 35mm wide image
and not a 50mm normal shot. Where's the 1:5 conversion with teh
kit lens?

The shot info in camera and in nikon view gives the focal length at
the time of the shot as 35mm etc.

You say that a 24mm is still a 24mm and that this is only a depth
of field issue.

But the camera's manual it describes the difference and makes no
mention, as I can recall, of depth of field.

What's the deal?

Question.

Is the kit lens then somehow different from say a prime in that the
conversion has been addressed specifically for the D70 with the
marking on the lens etc.?

Because with the kit lens 35mm is 35mm.

Or I'm a monkey's uncle.

 

[KENT GOH]

Hi Daz,

That's mean if I'm using Nikkor 50mm F1-8D on my D70, it will
provide a focal length of 75mm ( 50mm x 1.5 ). Am I right?

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[Daz_Genetic]

Technically no, but If it makes it easier to understand, you shouldn't have any problems remembering it that way. What you will get is a "crop factor", because your CCD is smaller than a 35mm film. This causes the Field of View to narrow, giving the impression of a longer lens.. But that isn't the case, the focal length on the lens, is always correct, no matter what it is projecting the image onto.

That's mean if I'm using Nikkor 50mm F1-8D on my D70, it will
provide a focal length of 75mm ( 50mm x 1.5 ). Am I right?

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[samjstern]

You are getting crazy on words and definitions.

The 50 mm is always a 50mm. Its focal length does not ever change.
It just LOOKS like a 75mm on the D70.

It does not change, it just "looks" like it did.

If you have a Nikon film camera at home do the simple test that the previous gentleman said.

The lens does not change
Just what you see in the D70 looks like you zoomed in.

That's mean if I'm using Nikkor 50mm F1-8D on my D70, it will
provide a focal length of 75mm ( 50mm x 1.5 ). Am I right?

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[NickL]

Sorry jammerbirdi, but I think you are painting yourself as a
monkey's uncle! When the kit lins is set on 18mm, you are seeing
the 'Field of View' of a 27mm lens on a 35mm camera! What you are
actually seeing is the
18mm image cropped so that you only see the portion that would be
covered by a 27mm lens on a 35mm camera.

John is spot on here. Forget magical extra magnification - you've got an angle of view that is equivalent to a focal length of 1.5x that on a 35mm due to the cropping to the centre.

There's no magic here. It took me a while to get my head around! You're not getting extra magnification, you're simply using a smaller image circle, therefore a smaller angle of view, therefore a perceived longer focal length (which is another way of expressing angle of view!)

Cheers,
Nick.

 

[Dmitry Klimenkov]

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

In simple words, using ALL Nikkor lenses with "DX" mark you can forget about 1.5 crop factor. (Kit lenses case, for ex.)
With ALL other lenses you have 1.5 crop.
That's it.

--
CP5000, D70, 24-120 VR IF ED, 80-400 VR, 50 f/1.4,SB800
http://baudy.homedns.org/gallery
Dmitry.

 

[thomas1973]

In simple words, using ALL Nikkor lenses with "DX" mark you can
forget about 1.5 crop factor. (Kit lenses case, for ex.)
With ALL other lenses you have 1.5 crop.
That's it.

As stated above, a focal length is a focal length is a focal length!

A 18-70mm DX is a 18-70mm no matter what! You still get the 1.5x crop compared to a 18-70mm used on a full frame SLR!

BUT the 1.5x crop factor is ONLY useful if you are used to how focal lengths look on a film SLR!!!!! The 1.5x crop factor is used for film SLR people to feel more at nome with how focal lengths look on the D70, as compared to their old film body!

If you're new to photography, you don't need to care about the crop factor at all! All you need to know, is that a 'normal' lens is now 35mm - it is 50mm on a film SLR, and 80mm on Medium Format - for your D70 it is 35mm. Anything lower is a wide angle, anything higher is a tele.

That's it, there's no more magic to it than that.

Thomas.

--
CP5000, D70, 24-120 VR IF ED, 80-400 VR, 50 f/1.4,SB800
http://baudy.homedns.org/gallery
Dmitry.

 

[KENT GOH]

Yes you are right, samjstern! It is a exactly what I mean.
Sorry for the misleading description. Hence, for non-DX
lenses like 50mm F1-8D will provide the result like 75mm
on D70. Anyway... Thank you very much.

The 50 mm is always a 50mm. Its focal length does not ever change.
It just LOOKS like a 75mm on the D70.

It does not change, it just "looks" like it did.

If you have a Nikon film camera at home do the simple test that
the previous gentleman said.

The lens does not change
Just what you see in the D70 looks like you zoomed in.

That's mean if I'm using Nikkor 50mm F1-8D on my D70, it will
provide a focal length of 75mm ( 50mm x 1.5 ). Am I right?

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[thomas1973]

Yes you are right, samjstern! It is a exactly what I mean.
Sorry for the misleading description. Hence, for non-DX
lenses like 50mm F1-8D will provide the result like 75mm
on D70. Anyway... Thank you very much.

The SAME goes for DX lenses! A focal length is always a focal length, it just looks different (ie, gives a different field of view) on different types of cameras!

Thomas.

The 50 mm is always a 50mm. Its focal length does not ever change.
It just LOOKS like a 75mm on the D70.

It does not change, it just "looks" like it did.

If you have a Nikon film camera at home do the simple test that
the previous gentleman said.

The lens does not change
Just what you see in the D70 looks like you zoomed in.

That's mean if I'm using Nikkor 50mm F1-8D on my D70, it will
provide a focal length of 75mm ( 50mm x 1.5 ). Am I right?

Hi folks

I'm just wondering if people are remembering to multiply the focal
length any lens on a digital camera by 1.5 ?
for example an 80-400, I believe would be a 120-600mm lens.
I think it's more important to remember that when dealing with wide
angles. There's a big difference in the look of a picture taken
with a 24mm lens on a film camera and a 24 mm lens on a digital
camera. The chip size on the digital camera basically makes it a
35mm lens.
just a tthought.
Michael DiOrio

 

[NickL]

People do seem confused by this 1.5x conversion. I know I was.

Perhaps, rather than trying to work with "equavalence" on a 35mm or full frame, we should talk about angle of view?

I wonder if that would clarify things?

Cheers,
Nick.

 

[jammerbirdi]

You are getting crazy on words and definitions.

The 50 mm is always a 50mm. Its focal length does not ever change.
It just LOOKS like a 75mm on the D70.

It does not change, it just "looks" like it did.

uh if it looks like a duck....

it's kind of irrelevant what the lens does or doesn't do by itself or on any other camera but the D70. On the D70 a 50mm lens is, for all practical purposes, a 75mm lens. That's how a 50mm lens functions on this particular camera.

Now, if true, I understand that. Actually I've understood it for weeks now and here's proof.

http://www.photo-forums.com/[email protected]@.ee98d0a/78

If you don't want to click on the link this is what I said on that board on the 12th of June.

"If you put a 28mm wide angle prime lens on the D70 what you're going to get due to a difference in the coverage area of the sensor on the D70 is actually about a 45mm normal lens.

Is this correct?

So I if I wanted to shoot say a 35mm I'd have to find about a 22mm to get that? "

Most of you guys have forgotten more about photography than I'm ever going to know and I can promise you that cliche is true in this case.

But if you're trying to illuminate the neophytes like me about focal lengths on the D70 let me speak for the neophytes in saying that what we care about is what the effective focal lenth of any lens would be when it is attached to the D70... the camera that's the subject of this forum.

So my understanding is correct as I stated a few weeks ago that if one buys a 35mm wide angle Nikkor lens for the D70 it will function on the D70 as a 50mm normal lens. Right?

Give or take a mm or so fellas huh. lol!

 

[DonAvebury]

Here's the deal.

It's now time to forget focal length.

It's all about field of view. When considering a lens, you want to know what its field of view is on your camera.

 

[jammerbirdi]

thank you!

All you need to know, is that a 'normal' lens is now

35mm - it is 50mm on a film SLR, and 80mm on Medium Format - for
your D70 it is 35mm. Anything lower is a wide angle, anything
higher is a tele.

That's it, there's no more magic to it than that.

Thomas.

 

[Daz_Genetic]

I tried that above, by referring to it as "field of view", it's proper name. I then got accused of saying that DOF is affected, and also another person accused me of "getting crazy on words and definitions"..

This is just one of those things that some people are going to have a hard time understanding. I personally don't see a problem but people's minds work in very different ways.

People do seem confused by this 1.5x conversion. I know I was.

Perhaps, rather than trying to work with "equavalence" on a 35mm or
full frame, we should talk about angle of view?

I wonder if that would clarify things?

Cheers,
Nick.