Can you identify what's the problem?

[Nezumi-kun]

I recently bought a 2nd hand Tamron 70-300mm. Since I just saw the ad while I was working, I immediately grabbed the lens since it was (1) on a bargain price (2) very near my place of work. My camera was not with me so I did not try it.

I saw this. Can you help me identify the problem of this lens?

 

[petrochemist]

Looks like the rear mount is missing. Is it one of Tamron's adapt-a-matic range? I know the adaptall & adaptall2 ranges don't look like that - they take bayonet mounted adapters.

It looks like there wasn't a 70-300 in the adapt-a-matic range so not that.
I guess it's a case of part of the lens missing.

 

[480sparky]

So what is the issue? It won't mount to the camera? The images are blurry?

It look like this is the front of the lens. I see no aperture linkage and I see what looks like filter threads.



ETA: Now that I've had a chance to see the OPs image on my desktop instead of my phone:

This cannot be the camera end of the lens. NO LENS is going to have an element that huge on the exit end.

 

[SuzukiGS750EZ]

I don't understand what the question is applying to there in the photo?

 

[480sparky]

I don't understand what the question is applying to there in the photo?

We may never know any more:

Nezumi-kun was last seen: Feb 7, 2018