70-400G or 500mm -is the 100mm difference great? simple test

Started Jan 9, 2011 | Discussions thread
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PC Wheeler
PC Wheeler Forum Pro • Posts: 16,371
Re: Cropping a 400mm image to the same FOV as a 500mm image

Robsphoto wrote:

One way of looking at this problem is to consider whether you would be happy with the results if you cropped an image taken with a 400mm lens to the same field of view (FOV) as you would get if the image had been captured with a 500mm lens.

I have written some notes about the advantages and disadvantages of cropping images to gain extra reach:

http://www.robsphotography.co.nz/focal-length.html

Here's an article on zoom vs. sensor resolution from the dusty past -- 11 years ago:

http://www.digicamhistory.com/Figure%20of%20Merit.html

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Phil
Canon 7D: Canon 15-85 IS, 70-300L IS, Others
Sony A55: Tamron 10-24, Sigma 18-250OS, Sony 70-400G, Sony 50mm Macro, Others
http://www.pbase.com/phil_wheeler

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