On Tue, 24 Feb 2004 20:28:28 GMT, (Maurice Gavin) wrote:

Wouldn't a single element lens need to be refocused for each RGB image
and thus be of a difference image scale eg blue image 'smaller' than
red image?

Yes, but the original poster proposed doing just that. You can fix the image
scale during post processing.


CYM wouldn't work as each filter transmits two primary
colours - each coming to a different focus.

CYM wouldn't work as well because the filter bandwidths are wider, that is
correct. Everybody who uses this technique with tricolor imaging and achromats
is using RGB filter sets.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com