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Old Apr 12, 2006, 6:53 PM   #1
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When useing a dedicated DSLR lens on a 35MM does the 1.6 factor work in the other direction to give a wider angle of view?
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Old Apr 12, 2006, 7:08 PM   #2
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Lenses are marked by their actual focal length. Focal Length doesn't change based on what type of camera a lens is mounted on.

Angle of view is what changes based on sensor or film size.

If you use a smaller sensor or film size, the angle of view will be narrower (more apparent magnification) for any given focal length.

If you use a larger sensor or film size, the angle of view will be wider (less apparent magnification) for any given focal length.

The only reason to even have a so called crop factor or focal length multiplier is so that users familiar with using lenses on 35mm cameras have a better understanding of how angle of view compares.

If 35mm cameras were not so popular, there would be no need to use them at all.

As for lenses designed specifically for DSLR models, they would behave just like any other lens with the same focal length when used on a 35mm camera from an angle of view perspective.

The only drawback is that some lenses are designed only for cameras with sensors smaller than 35mm film, so you may get vignetting if they can be mounted at all (and some lenses can't be mounted on 35mm cameras because of a physical difference in the mount, for example Canon's EF-S lenses).

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Old Apr 13, 2006, 8:25 AM   #3
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I know wwhat you are saying. No the focal length doesn't change. The "crop" factor gives thatimpression though. I was uncertainany vignetting affect though. Great answer, Thanks.
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