Originally posted by Nightsword Thanks a lot again, Mike.
Since my Tair 11A is not flushing with the camera body (it gets tighter beforehand), lens thread seems to be the issue. Is there anyway to fix that? Alternately, which cheap adapter should I buy?
You're very welcome
See below a photo showing how my Tair-11A sits against the mount of a Pentax ME Super. Does yours look like this when fitted, or are there extra gaps or bits anywhere?
Do other M42 lenses screw into your adapter without any problem? I'm wondering if there may be a slight mis-cut or damage to the adapter threads...
Have you tried fitting the adapter to the lens first, then fitting the lens and adapter combination to the body?
If you look at the inner threaded surface of the adapter, there's a small screw hole visible. Is the screw protruding through that hole? Or, do you see any rough edges to that screw hole? In both cases, this could foul the lens threads.
A couple of photos of the lens threads, plus another of the lens fitted to the camera (like my photo below) and screwed in as far as it will go, might help us in identifying the problem.
Assuming the difference between your setup and mine is a slight gap between the rear of the lens and the flush-fitting adapter / body mount, then you could try this:
Very lightly lubricate the lens threads with lithium grease (or some other fairly stable lubricant), then - with the adapter fitted to the camera - try mounting the lens and see if it will turn further this time, wiggling it gently side to side as you go. Also, try turning the lens whilst also pushing it gently in towards the camera. Try the same, but pulling the lens gently away from the camera. Sometimes, this can help with stubborn threads. Note - you want to avoid getting lubricant inside the camera, so if this does work, remove the lens and adapter from the camera and wipe away any excess before using it.
Feel free to PM me if you'd prefer