Hi, Thanks for that info on the retro-focus wide angle lens. All is clear to me now. Do you have any idea how to put a correcting lens on a microscope barrel instead of the eyepiece that will give my digital camera fixed lens a full frame magnified image? The eye ring for the camera lens is 35 mm so the lens on the microscope barrel will have be as large as that and fit in the barrel. Actually I think I saw a company who made such things, something to do with both telescope cameras and microscope cameras. I saw them as a show, but I can't remember.... Chris, http://www.chrisspages.co.uk In Memory of Maia, a sad, sad story. -----Original Message----- From: owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of ADavidhazy Sent: 22 August 2004 13:37 To: List for Photo/Imaging Educators - Professionals - Students Cc: andpph@xxxxxxxxxxxxxxx Subject: Retrofocus lens design was Digital lens question