03-26-2011, 01:07 PM
[quote name='Lomskij' timestamp='1301136339' post='7102']
Hold on, the DOF difference between FF and 1.5x crop is exactly 1.5x, or at least online DOF calculators show that. One aperture stop is 1.4, which affects DOF exactly in the same way - 1.4x. So 1.5 crop is slower by 1.5/1.4 = 1.07 stop, not a huge difference.
For nitpickers - I know that Nikon's crop is nearly 1.52x, however one aperture stop (sqrt 2) is not exactly 1.4 either <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/cool.gif' class='bbc_emoticon' alt='B)' />
[/quote]
Not all Nikon APS-C cameras have the same crop factor (And not all Canon APS-C cameras have the same crop factor either). So 1.52x might be a bit too precise? The D3100, for instance, has a crop factor of 1.56x.
Hold on, the DOF difference between FF and 1.5x crop is exactly 1.5x, or at least online DOF calculators show that. One aperture stop is 1.4, which affects DOF exactly in the same way - 1.4x. So 1.5 crop is slower by 1.5/1.4 = 1.07 stop, not a huge difference.
For nitpickers - I know that Nikon's crop is nearly 1.52x, however one aperture stop (sqrt 2) is not exactly 1.4 either <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/cool.gif' class='bbc_emoticon' alt='B)' />
[/quote]
Not all Nikon APS-C cameras have the same crop factor (And not all Canon APS-C cameras have the same crop factor either). So 1.52x might be a bit too precise? The D3100, for instance, has a crop factor of 1.56x.