The camera has a construction flaw when shooting bulb: When releasing the trigger, the aperture blades open before the shutter closes.
I have two BX20 kits, one owned from new, and an MTL3 and B100 acquired together a few days ago. I had a problem when I went back to use my BX20 after a decade or two of using other cameras. I forgot to disable the meter by setting it to B and I removed my 50mm to clean it, when I put it back on it wouldn't meter. I checked with the 70-210mm and that was OK so the problem is probably just a disconnected wire in the lens. I haven't put a film thought the MTL3 yet and the B100 is working but the lens is fungal and it appears to have sand in the lens and the body.
I need a camera that takes my Helios 44-2 58mm f/2.0 lens. Can't decide between Praktica and Pentax Spotmatic. :-|
iulian,
You are right the shutters are supposed to be titanium, however I'm not sure how much titanium is in the shutter.
To my information their segmented shutter curtains are from steel not titanium.
I have a body i used for spare parts at home so I'll drop a blade in sulfuric acid. In a few days we'll know for sure.
Have you tried cleaning the three brass contacts on the lens?
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