RE: How to calculate depth of field?

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

At 08:51 AM 7/3/00 +0100, you wrote:
>The calculations you require are as follows;
>
>Nearest point of focus = Ux(FxF)/((UxCxf)+FxF)
>
>Farthest point of focus = Ux(FxF)/(UxCxf)-(FxF)
>
>U = Subject distance
>
>F = Focal length of the lens
>
>C = Circle of Confussion (acceptable sharpness which their is a calculation
>for as well if your interested)
>
>f = f-number

And the tricky part to this is what you call an acceptable size for the 
circle of confusion... My Hasselblad SWC for example has a depth of field 
indicator that moves when you change the aperture to indicate the depth of 
field on the distance scale. It's very generous indeed and could be 
considered true if all you do is produce contact prints.

So in practise it also depends on how big you make your final image and the 
viewing distance from the image... which is probably why you don't see it 
crop up that much.


Cheers

Ben

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