Does anyone know the model # for the external viewer that can be attached to the back of the 10D and/or 1D?
I dont know quite how else to describe this, other than it is an "add-on" eyepiece that attaches to the camera and enabling easier viewing. I remember seeing on one Ebay once, but I didnt write down the #. Doh!
Are you perhaps referring to the Diopter extender. I bought one for my 20D. Its an EP-EX15. It also will fit the 300D. I'm not sure if it will fit the 10D. It makes viewing easier in the way that your nose isn't pushed up against the LCD viewer. I like it.