> I think technically they should be refocused (anyone, please correct me if > I'm wrong).....but in practical terms my experience is, they needn't be. Try > simply setting it to it's designed focal length and shooting....IMHO little > out of focus softness is often a plus. > > Mike > > > In a message dated 10/28/01 5:02:21 PM, tsh...@silver-bayou.com writes: > > << Once you have the zone plate focused for one object, will it be focused for > any other objects closer or further away, or do I need to refocus according > to the distance of my subject? > dwight >>
A zone plate focusses like a lens so you should adjust the focus for objects at different distances. On the other hand, they tend to have large f numbers (like f/32) so they have large depth of field. They are also hard to focus because they are so dim.