Originally posted by stevebrot This helps a lot. First of all, here is a link to a free* downloads of the Adaptall, Adaptall-2, and Adapt-a-matic manuals (pdf):
Tamron Adaptall / Adaptall - II instruction manual
A quick summary of those instructions goes like this:
To attach:- Turn the aperture ring to its widest setting (lowest number)...important
- Line up the green dot on the lens base with the green dot on the adapter
- Press the two together and twist the adapter until the silver retainer tab on the lens "clicks" and pops up. Check that the adapter is firmly retailed.
- Slide the index tab(s) into place into the indents on the aperture ring if they are not already there.
- There will be a 1mm gap between the lens base and adapter proper
To detach:- Turn the aperture ring to its widest setting (lowest number)...important
- Depress the silver retainer tab and twist the adapter off the lens base
The part about moving the aperture ring to its widest setting is important in that some adapters will not cleanly/freely attach/detach unless this is done. Both the P/K and P/KA adapters require this step and it is particularly important with the P/KA. Don't attempt to remove a P/KA with the aperture ring locked in the "AE" position.
I believe the above should help a lot.
Steve
* Jim Butkis provides free manuals, but is always grateful for a donation to help him meet the expenses of doing so.
That worked! Part of it is, I suspect, that the lens has some part of the "silver tab" removal mechanism that is jammed...I moved it into "mount" position manually. Then I attached the adapter per instructions, and it seems to have a good fit now.
I think I will either look into another 60-300, or perhaps save for a Pentax 55-300. The fungus on this lens makes me twitchy, and I wonder if I can get even clearer shots with a better copy. Or, perhaps even look at the SP 200-500, for astral, etc.
Thanks again, to all of you!