APS-C lenses

[Aharami]

does the focal length multiplier come into play for APS-C lenses also? Since the lens is designed specifically for crop sensors, do they design it with correct focal length markings? I'm wondering if 17mm on my Tamron 17-50 is really 17mm or is it 27.2mm

 

[jpeyton]

It's 27.2mm.

 

[Aharami]

:thumbsup: thanks

 

[Madwand1]

Originally posted by: Aharami
does the focal length multiplier come into play for APS-C lenses also? Since the lens is designed specifically for crop sensors, do they design it with correct focal length markings? I'm wondering if 17mm on my Tamron 17-50 is really 17mm or is it 27.2mm

Technically, the focal length does not actually change when you put a lens on a crop format camera, so the actual focal length is 17mm (or so) when the marking says 17mm.

However, from the perspective of full-frame equivalent field of view, 17mm on a 1.6x crop camera would give a similar field of view to a 27.2mm lens on a full-frame camera, as usual.