APC vs FF lenses

Started Mar 23, 2013 | Discussions thread
Edward Sargent
Edward Sargent Veteran Member • Posts: 4,693
Re: APC vs FF lenses

Bruce Oudekerk wrote:

Clayton1985 wrote:

APS-C lenses will work on FF with the expected limitations.

Actually there can be some unexpected NON-limitations.

When an OEM lens is used, typically the FF camera (a850-a900, anyway) crops the image to APS-C …BUT…apparently some or all aftermarket APS-C lenses DO NOT auto crop unless it is set up that way in the menu sub-system.

For example my Sony 18-250 auto-crops no matter what but the similar Tamron 18-250 does not.  That initially irritated me when I first got my a850 but its just a fact of life now.  I presume the a99 is similar. When using these non-cropping aftermarket lenses vignetting might or might not occur at any given focal length.

What still irritates me is that the tiny APS-C crop marks on the viewfinder in the a850 and a900 are worthless to me as real world usable guides.  Again I don’t lknow how the a00 handles this but it should be able to magnify that APS-C image to fill the EVF.  ….should:)  I'd be interested to find out.


A99 auto crops Sony lenses in EVF, LCD and Image file however Sigma and I presume others do not most be selected as APS

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