Zuiko Digital
Is focal length doubled in Olympus 4/3 digital bodies when using film lenses?
I have an OM 10 film body with 2 film Zuiko lenses. I put the 50mm lens on the film body, appears to be equal to what my eye sees in the viewfinder. Normal lens, makes sense. Put the same lens on my E-520 and again exactly what I see with my eyes in the viewfinder. I read that a 50mm film lens should be 100mm on the digital body. Am I missing something? I've read that the 4/3's is a half-frame sensor and you double all focal lengths. Anybody know the answer? Even still, 50mm on my digital zoom lens is still the same in the viewfinder as a 50mm film, fixed lens. Not what I've been reading. Thank you.
The short answer is yes. Actually, it would be a little more than 2x, since you have to use an adapter to get the OM lenses on the 4/3 mount.
A lens is what it is. Your 50mm lens is manufactured with a focal length of 50mm, the camera body does not change that. The lens will be a 50mm is respects.
"Crop factor" and "focal length multiplier" are terms that attempt to describe what happens when you put a lens of x length on a camera with a different image recording area. The lens remains 50mm, with the same attributes it had before. A crop/APS-C camera doesn't change the focus, blurring, or aperture of the lens. Al that changes is the apparent view.
Even the "designed for digital" lenses follow these rules. The numbers are correct for the focal length of the lens.
It is the small point and shoots that fudge this, where you might see "35-105mm Equiv", even though the actual lens has a focal length of 7-35mm.
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