Ever had an off-focus Jupiter-12 in Kiev mount?

[doubs43]

ack... I don't have any 35mm slr alas 🙁

OK...... time to make your own! I used a piece of cheap plate glass from a picture frame and very fine valve-grinding compound to make a ground-glass surface. Then I cut the appropriate size piece using a glass cutter. You only need to prepare a relatively small area of the glass and can do it in a corner so that you can make two cuts and have your ground glass.

Your best results will be with the finest grit you can find and even pressure on a flat surface that you can move in a circular pattern. I used a large, square gum eraser.

My ground glass isn't as nice as a commercial one but it works just fine. I tape it to the film rails - ground glass side against the rails - and use a 10x loupe (8x works well too) to check focus.

Walker

 

[Bob L]

Hi Max
I made mine using a small piece of Plex-e-glas and used 600 sandpaper on one side of the glass to rough it up, worked just fine.
You should not be able to turn the front element by hand, it should require a spaner to turn it, this may be you problem with it out of focus.