Thanks to all I get the bit about very small apertures, CCDs and abberations now. I was being a bit dense before.
But one question remains, which I shall try to be more concise about... and I think i've got my d.o.f and f.o.v s right this time (I have become aware of at least one typo in my original posting): 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? William was almost there with >the depth of field will be more than adequate. But a more precise answer would help me decide to part with the cash. It is basically a purely practical yes/no question and I could set up a rig to test it if I had a digi, but I don't. I could also find out if I had some kind of table of fields of view for lenses of different focal length at different apertures. Which I don't either. Or do the abberations means that one cannot actually use an aperture small enough to achieve the depth of field achieved on the 35mm, because the image would appear out of focus due to diffraction etc? Giles Stokoe photographer/photojournalist. See some images at http://www.stokoe.co.uk =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
