In article , hao@rtcmain.rtc.riken.go.jp says...

>Does anyone know DE-5 viewfinder for F3?
>Of difference from the DE-3, it has a hot-shoe socket on the top, which
>onws only two metal contacts. But it has a small 'HP' print too at the
>front-right-bottom corner as same as the DE-3. Can you tell what
>feature(s) it has?

I think it is the HP finder for the F3P, and if so, the shoe will not
fire a flash if the prism is used on a standard F3 (no wiring in the body for it).
Hope This Helps