crop factor on older lenses

Started Jun 6, 2014 | Questions thread
micksh6 Senior Member • Posts: 2,613
Re: crop factor on older lenses

mbower wrote:

Ok, my next question -

I understand crop factor and that my 45mm lens is equivalent to a 90mm lens in the 35mm world.

But how do I calculate the crop factor for an older lens?

I'm just curious. Do you think crop factor depends on the age of the lens? Like, crop factor changes when lens becomes older?

You got it right in the first statement. It's as simple as that regarding focal length.

I have the adaptor that lets me attach my Nikon 35mm prime to my M43s body.

What is the general crop factor that should be applied when one uses older lenses?

When does lens become "older"? Nikon announced a new 35mm F1.8 prime in 2014. Will it have different crop factor from your old 35mm prime?

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