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Steve Spencer wrote:
The thing to keep in mind is that if it is a 4 X 3 aspect ratio, then you would need to crop a 3 X 2 sensor quite a bit to get that aspect ratio, so you are in effect using a slightly cropped FF 35mm sensor. When comparing aspects ratios of 4 X 3 or squarer the crop factor is .73. When you are comparing 3 X 2 aspects ratios (or skinnier rectangles) then you need to crop the miniMF sensor so you are in effect using a cropped miniMF sensor. The crop factor for 3 X 2 or skinnier rectangles is .82. You can let Lee's calculator do all the work, however, and just use compare sensor by height button for 4 X 3 for squarer crops and compare sensor by width for 3 X 2 or skinnier rectangular crops. These apply the .73 and .82 crop factors respectively....Show more →
a 35mm f/1.8 lens
with a 43.8 x 32.9 mm sensor
produces Field of View : 64.07 x 50.35 x 76.09° (WxHxD)
which is comparable to...
a 27.6mm f/1.42 lens
with a 36 x 24 mm sensor
I guess it depends on your basis of comparison. I'd think the diagonal would be the most accurate representation of DOF, being a number that reflects the area of sensor. I use width to understand my angle of view horizontally.
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