How I made a push-on lens cap for an older collapsable lens. This will work great for just about any size and type of lens. The lens I made one for is a russian built Industar-10. Like other russian lens's made around the same period not that many lens caps were made for them and most of those have long since been misplaced or cast aside. Leica made quite a few in the same diameter, but their most popular lens's were a bit larger and the caps that can fit the plentiful russian lens's can be a bit pricy. So, this is a solution. They're easy to make and extremely cheap, so you don't have to worry about dropping it or setting it down and forgetting about it - no more retracing your steps for an hour searching for that shiny little cap with the word Leica on the front. While mine certainly does not look like much, that can be improved upon. One simple and effective way is to cover it with leatherette, the same stuff on camera bodies. Or just go crazy on the paint job, make something unique to you.
website where I took the idea from: http://jay.fedka.com/index_files/Page413.htm
- If you do have an older press on lens and you find that it's not fitting very tightly it's probablly just that the felt around the inside is worn down or damaged. Since that's all there is to hold the cap onto the lens, simply replace it and you should be fine.