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4/3rd crop factor

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The four thirds system has a 2x multiplier of 35mm.

E.G. A lens that is 25mm on a 35mm film plane = 50mm on a 4/3 sensor.
 
You are probably now get to get a huge horde of anal people leaping up and down and pointing out that, because the lenses and sensors match, there is no crop factor.

However, the answer you are looking for is "Two". Best to call it an Effective Focal Length multiplier or something though - keeps the nutters happy :-)
--
http://www.flickr.com/photos/acam
 
As compared to what?
645, 8x10, 5x7, ad infinitum.
What's the "crop factor" of 35mm (24x36) as compared to the Hubble?

There seems to be an assumption that 24x36 is a "standard" which it is not. It is merely a format.
The term "crop factor" is a misnomer.

If you'd like a discussion regarding the FOV [field of view] of various lenses in relation to the size of the capture medium, oh!, that would be a different discussion and that's not what was asked.
There is no crop factor.

--
Troll Whisperer
Bill Turner

 
There is none when using lenses designed to the 4/3 format. The 4/3 is half the size of the 135 or 35mm format. Hence when using a 35mm lenes such as one of the Oly OM lenses from the old 35mm film cameras the crop factor in x2
--
Gary S P



http://www.garysworld.net
 
Since they have special lens in comparison to their cameras are they in theory and different than the conventional 35mm FF and normal lens.
 
Xavier Springer said:
Since they have special lens in comparison to their cameras are they
in theory and different than the conventional 35mm FF and normal lens.
Click to expand...
There is no crop factor. The 4/3 format is full frame. You probably meant to ask for a 35mm conversion factor, which is 2X (or actually 1.94X, according to Olympus).

The Zuiko Digital (ZD) lenses are designed to optimize sensor performance. The sensor's photo elements need to be struck by light perpendicularly to avoid serious image degradation. Therefore, the ZD lenses employ a tele-centric design which funnels the the incoming photons into a path perpendicular to the sensor's elements.

Regards,
J A P
 
on the front of a 4/3rds camera you will get the same field of view as a 100mm on a 35mm camera.

So my 50-200 lens behaves, in most ways, like a 100-400 in old money, but is much lighter and smaller.

When digital SLRs started many had a smaller sensor than the lens were designed for. Hence the "crop factor" - because only part of the lenses' intended image circle was used. Because 4/3rds have dedicated digital lenses, they don't have a crop factor, all the lens designed to be used is used. However, nobody NEEDS to know that. The EFFECT is the same as a 2 times crop (except you are not lugging around a load of unused glass).
--
http://www.flickr.com/photos/acam
 
Louis_Dobson said:
Because 4/3rds have
dedicated digital lenses, they don't have a crop factor, all the lens
designed to be used is used.
Click to expand...
Then how do my images turn out rectangular? Lenses create circular shaped images, yet the edges get cropped. By some definition of the world even a 4/3 lens gets cropped.
 
4/3rds offer a large image circle in the interests of telecentricity, if you want to be picky.

However, I don't think the OP wanted a boring lecture, I think he wanted the answer "two", reassurance that the lenses otherwise behave more or less normally (I've left out DoF and equivalence), and we've tipped him the nod that "crop factor" is a good word for annoying the irascible. That's a good night's work, don't you think?
--
http://www.flickr.com/photos/acam
 
Louis_Dobson said:
You are probably now get to get a huge horde of anal people leaping
up and down and pointing out that, because the lenses and sensors
match, there is no crop factor.

However, the answer you are looking for is "Two". Best to call it an
Effective Focal Length multiplier or something though - keeps the
nutters happy :-)
Click to expand...
I looked everyone on my E-1 and in its menus. I can't find a "crop factor" setting anywhere. No such setting on any of my lens barrels either. The 4/3 system has no crop factor I can find. No "EFL multiplier" settings either.

Mind you, in a relaxed comparison my Zuiko 14-54mm gives me the field of view of a 28-108mm on a 35mm camera, but the images I get don't seem to be cropped in any way.

For what it's worth, if someone can't take 14-54mm vs 28-108mm and do the math, then he doesn't deserve to own a camera. 8-)

Yep, I'm one of those nutters. Always have been. Always will be. I wouldn't have it any other way. I don't use a Mac though.

--
Cheers,

Jim Pilcher
Colorado, USA

'Begin each day as if it were on purpose.' -- Mary Anne Radmacher
 
Bootstrap said:
There is no crop factor.
Click to expand...
There must be a crop factor or why would the question keep coming up year after year?

That being said, I still can't find a crop factor setting anywhere on my E-1.

--
Cheers,

Jim Pilcher
Colorado, USA

'Begin each day as if it were on purpose.' -- Mary Anne Radmacher
 
Xavier Springer said:
I'm interested to know the crop factor on a 4/3rd sensor.
Click to expand...
4/3rds 18mm (W) x 13.5mm (H) 22.5mm (DIAG) 43.3/22.5=1.92444
Nikon D70 23.7mm (W) x 15.7 (H) 28.4mm (DIAG) 43.3/28.4=1.5246
CanonXTi 22.2mm (W) x 14.8mm(H) 26.68mm(DIAG) 43.3/26.68=1.6229

--
Riley

real men get zippo haircuts
 
There is no crop factor. Despite that fact everyone knows perfectly well what the OP asked about. It resembles me about FF which also either doesn't exist or is everywhere; Oly is FF but we also know the sensor size is about a quarter the size of a FF sensor (and for the touchy and witty reader let me add that I count the area when I use the word size).

I don't know who coined the abbr FF but one has to admit that it was brilliant. Maybe it was Oly when they started to make the half format cameras?

One thing I don't understand is that my camera has no crop factor when I use my ZD50/2 but gets one when I mount the Zuiko 50/1.2. But who would use a legacy lens?

--
Jonas
 
PhotoTraveler said:
Yet, Oly makes the crop factor clear in their press release and puts
the FOV equivalents in there.
Click to expand...
But... how can that be...? Well, wait a couple of days and the question will be asked again. By then somebody will have invented a new way of declaring and explaining the absence of mentioned factor.

--
Jonas
 
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