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ren's 35mm Elmarit-- The lens is 35 or 40 years old and, therefore, the lubrication in the focusing ring is probably dried up.
You might try putting a small amount of lighter fluid [like Ronsonol] on a cue tip and rubbing the wet cue tip around the focusing ring, a tiny bit at a time, so that the fluid gets in the threads. The lighter fluid should loosen the caked lubrication inside the threads of the focusing ring and the ring should gradually turn more easily. --bob cole