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DxOMark 200D Results Confirm Earlier PhotonsToPhotos Measurements

Started Oct 25, 2017 | Discussions thread
ThrillaMozilla Veteran Member • Posts: 7,681
Re: DxOMark 200D Results Confirm Earlier PhotonsToPhotos Measurements

davev8 wrote:

well touching on size i don't think most realize that lenses that give certain field of view and DOF so are "equivalent " are of similar size across all formats from m34 to FF

This is off the subject, but yes, good point. The entrance pupil has the same diameter across all formats.

That doesn't necessarily apply to the overall lens size, however.  In the telephoto range, full frame would usually require larger and heavier lenses for the same field of view. For example, a 250 lens for APS-C is equivalent to about 420 mm on full frame, and the 250 would generally be much lighter and smaller.  (There are some complications and maybe some exceptions, but it's really off the subject.)

 ThrillaMozilla's gear list:ThrillaMozilla's gear list
Canon EOS Rebel SL1 Canon EOS M6 II Canon EF 400mm f/5.6L USM
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