03-24-2012, 11:57 PM
[quote name='IanCD' timestamp='1332621736' post='17011']
I think 5:4 (crop) mode indicates that the FoV is equivalent to a lens with 1.25x FL so you'd multiply by 1.25 to get effective FL. D800 is cited as having a 1.2x crop factor... not sure why it would be 1.2 rather than 1.25...?[/quote]
No, 5:4 changes the aspect ratio. It uses a 30x24 crop of the sensor. Basically, it crops horizontally, but not vertically. Technically, that's a 1.14x crop factor, since crop is measured by the diagonal.
1.2X uses a ~30x20 crop of the sensor (3:2 aspect ratio), and does indeed result in a 1.2x crop factor.
DH
I think 5:4 (crop) mode indicates that the FoV is equivalent to a lens with 1.25x FL so you'd multiply by 1.25 to get effective FL. D800 is cited as having a 1.2x crop factor... not sure why it would be 1.2 rather than 1.25...?[/quote]
No, 5:4 changes the aspect ratio. It uses a 30x24 crop of the sensor. Basically, it crops horizontally, but not vertically. Technically, that's a 1.14x crop factor, since crop is measured by the diagonal.
1.2X uses a ~30x20 crop of the sensor (3:2 aspect ratio), and does indeed result in a 1.2x crop factor.
DH