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Old 22-01-2013, 10:50 PM
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OzEclipse (Joe Cali)
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OzEclipse is offline
Join Date: Jun 2012
Location: Canberra, Australia
Posts: 948
Originally Posted by mithrandir View Post
Joe, that must depend on the camera. Canon have a 1.6 crop. Sony have a 1.5 crop. I forget what Nikon is but it is a bit different again. So does 400 apply to Sony and should it be 375 for Canon?.

You are reading way way too much into this. It's a very rough guideline not a precise calculation. For a 14mm lens the difference between using a factor of 400 and 375 is about 2s difference in exposure or 0.002 microns or about 1/2000 of one of your 4um pixels. It doesn't matter.


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