Confusion with equivalent focal lengths, SEL18-200mm and SAL70-300mm

Started Dec 16, 2012 | Discussions thread
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DimitriDV Regular Member • Posts: 361
Confusion with equivalent focal lengths, SEL18-200mm and SAL70-300mm

Hello all,

I found a cheap Minolta lens which is basically (as I understand) the same as the SAL 70-300mm, which I might want to buy to use with my Nex-6 (with adapter). Link to data about the lens I'd get

Now, I was trying to compare it with the E-mount lenses, such as the SEL18-200 and SEL55-210, to understand what results in terms of zooming I would have with my photos, and am getting confused to say the least, even if I thought I understood the theory about focal lengths, crop factor etc..

The question I want to answer is: with these two lenses, do I get the same image at maximum zoom? or does the SAL70-300 result in a bigger subject in my final image?

My confusion derives from the "35mm equivalent" data I read on the web.

For the SEL18-200 (lens for APS-C camera) I read: "APS-C only, and will only mount on E body cameras.  With crop factor of 1.5x the coverage equals 27-300mm."

For the SAL70-300 (lens for 35mm camera) I read: "Full frame and APS-C.   APS-C equivalent, 112-450mm"

Does the above mean that 18-200mm is the 35mm equivalent? Or is the APS-C equivalent value (112-450mm) wrong as I would expect then to divide by 1,5 instead of multiply?



Sony Alpha NEX-6
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