To keep the mathematics simple, consider the formula for hyperfocal distance:
hd = f ^2/Nc + f
where
c =permissible circle of confusion
f = lens focal length
N = lens f-number
hd = hyperfocal distance
This shows that hyperfocal distance varies with the square of the focal length and varies inversely with the aperture number and with the acceptable circle of confusion. So if, for example, you halve your sensor size, you need to halve the focal length to get the same field of view, but you need to halve the circle of confusion to get the same image detail on your print. Doing a quick calculation on your data I reckon the answer is 'yes'
But there a caveat. There is the issue of depth of focus. This is given by
df = 2 x N x c
where
df = depth of focus
N = f number
c = acceptable circle of confusion.
This implies that, with smaller sensors, focusing needs to be very much more accurate to achieve the desired zone of sharpness.
However, given the improvement in depth of field with the smaller sensor, you should be fine unless focusing is very inaccurate..
Tim Mimpriss
Giles Stokoe wrote:
Using a particular focal length lens to get a particular field of view on a
35mm camera (shall we say, that of a 35mm lens) I can get a certain depth of
field at f22. Can I get the same depth of field on a digi (of reduced
image/sensor size) using a lens of the same field of view (whatever focal
length this needs to be... it would be 7.2mm on Alex's G3) at the min
aperture of f8?
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