R. Bush wrote:
I finally decided to add the 645 format to my 49 year collection of Pentax 35mm cameras. I need to locate a +3 diopter piece to go in the slide-on eyepiece with the rubberized hood. I can't find any on eBay. Are there any other slide-on diopter pieces for other cameras that will fit the grooves of my Mamiya 645 1000S prism tops? Hopefully, someone has come up with an alternative. Thanks for any suggestions.
I would check on apug in their medium format section and post something there. You might have better luck in that specific forum.