Originally posted by texandrews I have one but don't really use it. The articulating screens on my cameras and their zoom functions do the trick most of the time. I have a job coming up that I may need it for, though.
See my review on the angle finder for the 645n. I use it for close ups so I don't have to lie on the ground! Note that the threads mounting the finder to the camera's eyepiece are pretty fine in pitch. Cross threading it could result in an expensive repair, if the camera threads were damaged. The angle finders for the K mount and M42 finders just slip onto the slotted eyepiece - simple, quick, and very unlikely to damage anything. BTW, K mount and M42 angle finders are NOT interchangeable. IIRC the K mount finder will interchange with the OM series film Olympus cameras.
If you find one cheaply, why not buy it??