Stiff diaphragm ring
I picked up a Praktina FX I got it for the lens a B Jena 58mmf/2 Which if I am right is the classic 58mm Biotar I had one once before in the olden days with automatic nothing, but a fantastic lens. The lens is a present which means you focus wide open and then manually close down the lens to a present stop The preset ring itself is spring loaded and works fine but the barrel it connects with is very very stiff I am guessing the lube has dried up So while my impatience screams oil it I dont want to wreak what may be a fine lens . Any suggestions as to remedies or best repair services for old lenses
I picked up a Praktina FX I got it for the lens a B Jena 58mmf/2 Which if I am right is the classic 58mm Biotar I had one once before in the olden days with automatic nothing, but a fantastic lens. The lens is a present which means you focus wide open and then manually close down the lens to a present stop The preset ring itself is spring loaded and works fine but the barrel it connects with is very very stiff I am guessing the lube has dried up So while my impatience screams oil it I dont want to wreak what may be a fine lens . Any suggestions as to remedies or best repair services for old lenses