Having recently discovered what an improvement it is to shoot with a diopter on the eyepiece instead of glasses (with my OM cameras and a Nikon FG diopter -- which fits perfectly) I bought a Nikon F diopter to see if I could rig it up to my Canon 7. It is round but the lens and threads on the mount are larger than the Canon 7 eyepiece. So I think there are three possible choices.
Option 1) Cut down the Nikon lens to fit the Canon 7 eyepiece and press fit (or glue) it in. The present lens in the Canon seems to be press fit and is removeable. No sure exactly how much work it would be to grind away the excess lens and of course I would need to maintain center and not trash the lens. Or is there a Nikon diopter that is slightly smaller than the one made for the F3 that might fit better?
Option 2) Remove the top plate and slightly enlarge and tap the correct threads for the Nikon diopter. This would be super neat when completed and allow for putting in alternate powers if someone else was using the camera.
Option 3) Take out the Canon eyepiece, remove it's lens, and somehow attach the Nikon eyepiece to it -- sort of using the Canon as a thread adapter. For example if I could get a thin brass (or plastic) nut to match the Nikon threads - and solder or glue it to the Canon eyepiece (which has a flat flange on the part facing the shooter). Does anyone know the threading of the Nikon eyepiece? This option is the most kludgy but at least makes it harder to bugger up the camera or the diopter!
Anyone tried anything like this? Is there a better option I haven't considered?
On an odd note I picked up a spare eyepiece for the Canon as I scratched up the original taking it out and discovered that the original had a -1 power lens in it whilst the replacement had a 0 power. The Nikon I got is listed as -3 which works perfectly without any added power but actually measures -2. The same -3 is really -2 situation is true of the Nikon FG diopters I am using in my OM cameras.
Option 1) Cut down the Nikon lens to fit the Canon 7 eyepiece and press fit (or glue) it in. The present lens in the Canon seems to be press fit and is removeable. No sure exactly how much work it would be to grind away the excess lens and of course I would need to maintain center and not trash the lens. Or is there a Nikon diopter that is slightly smaller than the one made for the F3 that might fit better?
Option 2) Remove the top plate and slightly enlarge and tap the correct threads for the Nikon diopter. This would be super neat when completed and allow for putting in alternate powers if someone else was using the camera.
Option 3) Take out the Canon eyepiece, remove it's lens, and somehow attach the Nikon eyepiece to it -- sort of using the Canon as a thread adapter. For example if I could get a thin brass (or plastic) nut to match the Nikon threads - and solder or glue it to the Canon eyepiece (which has a flat flange on the part facing the shooter). Does anyone know the threading of the Nikon eyepiece? This option is the most kludgy but at least makes it harder to bugger up the camera or the diopter!
Anyone tried anything like this? Is there a better option I haven't considered?
On an odd note I picked up a spare eyepiece for the Canon as I scratched up the original taking it out and discovered that the original had a -1 power lens in it whilst the replacement had a 0 power. The Nikon I got is listed as -3 which works perfectly without any added power but actually measures -2. The same -3 is really -2 situation is true of the Nikon FG diopters I am using in my OM cameras.
