I recently acquired a Seiko 60mm Kellner. The surface on the top element has a haze that is rough when I lightly run my finger nail across it. I've tried Purasol and Zeiss lens wipes but neither has worked. Any suggestions for how I can restore this? If it needs professional attention, who are the professionals? I would really like to return it to glory if possible.
I posted this in the Eyepiece forum in a thread with a different topic but it got buried. I thought I would post it here to see if there are other suggestions.