Fix Broken Aperture Ring

I recently disassembled one sample for repair.

Fix broken aperture ring.

There are three basic types of m42 aperture controls listed here in chronological order. It still looks great from above but is much stronger. This little instructable is about how to make aperture control f number setting on each of these types of lenses work on your dslr. Be sure you see an actual aperture stop right behind the lens that blocks light from the sky.

Sometimes the ring must be altered a bit to give it strength. I really enjoy using m42 aka screw mount lenses. A ring with a small fracture in the band or that is completely broken into two or more pieces should be taken to a store to be soldered and filed back together. As usual first step is to unscrew four mount bolts and remove thick and massive mount ring.

Click stop mechanism is self secured so it s safe to remove aperture ring without loosing tiny metal. Vivitar 70 210mm f4 5 lens version made by kobori has interesting mechanical construction of aperture transmission. Manual focusing is a great exercise and the quality of the glass is often surprising. Have your jeweler repair the point that is broken.

The catch is that all three types can have no response to turning the obviously marked aperture ring without being broken. The lens i used here in this video is th. Be careful reflections can sometimes look a lot like these rings. Also the main lens should be at least two inches across.

If there is a ring like this farther down the tube ignore it it s no problem. Most are about 2 5 or so. In this video we will be looking at a way to fix aperture ring getting stuck in manual lens or in any vintage lens.