|Posted: Sat Sep 14, 2019 7:52 pm Post subject:
|Thank you very much, Tim! That worked like a charm. I tightened the four screws that you indicated, and the focusing ring goes now without any "slipping".
But when I was unscrewing the screws I accidentally moved the lens, and it went off the diaphragm pin. After the initial 3 minutes I spent another hour trying to put the lens back aligned to the pin. This is not an easy task, as the helical screw is composed of two parts, including a copper inlay ring. When you screw it into the helical cage, the lens unscrews, and vice versa. Nothing worked.
After many void attempts I left it over. So I reassembled the lens with the aperture fixed at around f2, just to keep the dust away from it. And suddenly the pin took a right position, I did not understand how. Now the diaphragm works as intended or almost, the focusing ring does not slip. But... I lost infinity. That makes me lough, with this lens I did not have an easy solution. So, I will disassemble it back again and will try to fix infinity.
By the way, the lens block is very well built and gives an idea of a tightly encapsulated construction. The diaphragm control is well hidden inside, and you will hardly take the lens a part by accident.