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04/21/2008 09:22:17 AM · #1 |
Hi,
Not having any opportunity to try out the much raved about 5D, I have always assumed that the effect of lens compression for instance on a face, would be much the same on a 40D, zoomed wider.
Is this true? I mean, I know if I throw my lens on a 5D, I'll obtain a far wider field of view, but will it bring the same elongation as if I threw a wider lens with a similar field of view on a 40D?
Thanks,
Bert |
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04/21/2008 10:06:01 AM · #2 |
| The only factor in perspective (the elongation) is the distance to the subject. The focal length of the lens and size of the sensor only change the field of view. (In other words, noses become bulbous with a wide angle lens only because you are closer to the subject -- if you move out to the same distance that you would use with a telephoto, the faces would have identical perspective, just the face taken with the telephoto would take a much smaller portion of the frame. |
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04/21/2008 11:01:27 AM · #3 |
Let me elaborate on that: from any given camera position, centered on any given subject, the lens is irrelevant. That is to say, if you pose your sister on the end of a jetty jutting into the sea and stand at the foot of the jetty and take 3 shots, one wide angle, one normal, and one telephoto, and THEN crop the two wider shots to match the coverage of the telephoto, those images would be indistinguishable from each other except for the increased "noise"/lack of resolution that shows up on extreme crops.
It's the same way with a "cropped sensor" vs a full-frame sensor, using the same lens on each: if you crop the FF image to match the 1.6 image, the shots will be identical. The larger the sensor, the "wider" a lens mounted to it becomes, because its angular coverage increases. Taken to an extreme, on 4x5 inch film cameras ("view cameras") a 70mm lens is a VERY wide-angle lens. On a FF (35mm) camera, it's a slight telephoto.
R. |
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04/21/2008 12:41:03 PM · #4 |
Cool. Shudov figured, I suppose.
Thanks |
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04/21/2008 01:02:52 PM · #5 |
| To complement Bear's thoughts, if you want to frame something the same way with a 40D and a 5D, using the same lens, you need to be closer with the 5D versus the 40d, and thus the perspective will be different. This is the scenario we are usually interested in. What it tells us is that for like results, we really do want a longer focal length with a larger format. |
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