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Tamron 01A sleeve cap
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PostPosted: Wed Apr 03, 2013 12:43 pm    Post subject: Tamron 01A sleeve cap Reply with quote
I have Tamron 01A lenses under accumulation. I brought in my third copy yesterday only to discover (what I now realize is) a free sleeve cap, which actually fell from the rear of the lens. It was confusing to me since I didn't know what it was.

Concerned, I immediately retrieved by best copy of this lens which, as things turned out, was no help at all. Examining it carefully for anything which looked like the free cap, or ring, I found nothing whatsoever. Thus, my confusion continued.

It was only after searching out my third 01A, a "fixer upper" lens I bought on the cheap, that I was able to discover the role of the loose part. The "fixer upper" lens, despite everything else, contained a proper and complete sleeve with the cap still cemented firmly and properly in place. Seeing that, all was made clear.

I was annoyed that my first, and I though my best, copy of the lens was shipped to me without any sleeve cap at all and I never even knew! You don't miss what you don't realize should be there, but is not there. Only by comparing with a complete lens was I able to spot this annoying deficiency.

Once the cap has become detached, the sleeve surrounding the rear group is free to slide about in a manner, I think, not intended by the Tamron designers. Whether this is a serious matter, or not, I do not know. But live and learn. I'll surely be more discriminating in future.

I also have before me the task of reattaching the loose sleeve cap for the 01A lens just received. That will be a challenge in itself given that, without disassembly, the sleeve is "buried" and its setting is somewhat oily.


PostPosted: Wed Apr 03, 2013 5:15 pm    Post subject: Reply with quote
Could you expand on what you mean by 'sleeve cap'? I'm a little confused.... Confused


PostPosted: Wed Apr 03, 2013 7:25 pm    Post subject: Reply with quote
Xpres wrote:
Could you expand on what you mean by 'sleeve cap'? I'm a little confused.... Confused


Sure

There is a sleeve surrounding the rear lens group. As the group moves fore and aft it slides in that sleeve. On the end of the sleeve nearest the camera there is supposed to be a cap, a ring, if you will. It (as best I can tell) is glued to the sleeve.

There are two holes at the rear of the rear lens group to facilitate unscrewing the group. If present, the cap will tend to cover over those two holes. Why they made that sleeve in two pieces I've no idea. If the cap were part of the sleeve, all made from the same piece of plastic, it could never come loose and fall out.

It had me going yesterday. I had no idea what the thing was. The lens came with an adapter and I thought possibly the cap might belong somehow to the adapter . . . . though I could not see how. Only after seeing a cap correctly in place in my "fixer upper" copy of the lens did I understand. I was darn lucky the cap was not lost by the previous owner. It was completely free and it is small. It would be very easy to lose.

What I am calling a "cap" is actually a ring of plastic that is bonded to the camera end of the sleeve. It "caps" the sleeve. But it is in reality a ring of plastic with a hole in the center, else it would cap the lens itself.


PostPosted: Thu Apr 04, 2013 10:15 am    Post subject: Reply with quote
Ah... OK, I get you now. thanks.
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