Fix Broken Aperture Ring

Vivitar 70 210mm f4 5 lens version made by kobori has interesting mechanical construction of aperture transmission.

Fix broken aperture ring.

Sometimes the ring must be altered a bit to give it strength. Click stop mechanism is self secured so it s safe to remove aperture ring without loosing tiny metal. Manual focusing is a great exercise and the quality of the glass is often surprising. I really enjoy using m42 aka screw mount lenses.

Also the main lens should be at least two inches across. The lens i used here in this video is th. There are three basic types of m42 aperture controls listed here in chronological order. It still looks great from above but is much stronger.

In this video we will be looking at a way to fix aperture ring getting stuck in manual lens or in any vintage lens. 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. In the case of the above ring a gold section was added underneath.

Most are about 2 5 or so. I recently disassembled one sample for repair. Or if you notice a weak area have it beefed up before it cracks or becomes damaged. Be sure you see an actual aperture stop right behind the lens that blocks light from the sky.

While the ideal option is to return to the same store or jeweler from which the ring was bought large chains like kay jewelers will perform repairs no matter where the ring was purchased. The catch is that all three types can have no response to turning the obviously marked aperture ring without being broken. If there is a ring like this farther down the tube ignore it it s no problem.