Hui Wu wrote in article <5u1il6$2l9$1@cnn.Princeton.EDU>...

> I've got a NIKON right-angle viewing attachment for my F3HP. I know that
> I need a DK7 adapter. However, the eyepiece on my F3HP doesn't have a
> thread. I think it's probably the standard DE-3 prism. Any suggestion on
> how attach it to the F3HP?

Unscrew the rubber-rimmed eyepiece to reveal the thread.
Hope This Helps
David Ruether - http://www.fcinet.com/ruether