Lens mount wobbling and sometimes doesn't recognize lens

Hey

I think I've the same problem as yours with my A55. Fist it happens with my 70-300 ssm than with my 24-70 ssm and now with the 16-105. I dont think it is the rotatory problem but the axial because of the wheight of the lens.
What could help this problem ? I dont know replacing it with a A77 perhaps.

My adivse above should be enough to find the trouble. Did you read & follow my message ? Weight problem is very unlikely.

Sorry Chimere, I didnt want too hurt you. English is not my maternal language. I wanted to give my opinion because what Julian describes seems similar to what happens to me. If I've understood julian wrote that the problem happens with many lenses not only one :

"I'm am certain it's not the lens fault because kit happens with other lenses too..... My 50 f1.4 Sony , my 16-50 f2.8 , my 55-200 , my 28-300 tamron......."

Before I Get to That, all of my lenses on my A65 have a little bit of play in the mount. However, it is not anything severe or causes any problems for me. As for my Tamron 17-50mm F2.8 I was concerned because it felt too loose. I immediately contacted Tamron and here is what I wrote;

Note To Tamron

The lens SP AF17-50mm F/2.8 XR Di II has a bit of movement in the mount of my Sony Alpha A65. When I zoom in/out the lens feels a little loose which has me concerned. It does perform properly, but what about wear and tear to the mount? There is also a little play in the zoom ring. I just think that over time, this condition will get worse. I was intending to use this lens primarily and would remain on my camera. Is this normal and if not, what can I do about it? Thanks, James

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I had already Sent the lens back to Amazon and got a replacement. I must say that there is less wobble in the replacement so I am satisfied with it.. Here is the reply I received from Tamron regarding my message to them. As you will read, they are saying that some small amount of play in the mount is normal. I can't say or no how bad yours is without seeing it for myself. But after receiving my replacement lens and hearing from Tamron, has me feeling less concerned. I know your issue is with the lens losing contact with the camera body. So this is likely something to have repaired. Anyway I hope this helps

Received from Tamron

Hi James, Thanks for contacting Tamron! It is normal for a lens to have a small amount of play in the mount (otherwise it would be too brittle and would easily break). It is hard to tell over email whether yours is within spec or not. There really shouldn't be much play in the zoom ring, though. I would recommend sending it in for inspection and possible repair service. If you would like to send it in for repair, please include the attached repair form, and also include a copy of your sales receipt OR your warranty confirmation number. Without a sales receipt, or for lenses that are out of warranty, or have been dropped or tampered with, there will be charge for repair. If you cannot find your receipt, I recommend calling the store; they are usually happy to reprint your receipt for you. If your lens is still under the 6 year warranty but your lens has suffered from physical damage, the warranty will be reinstated after any paid repairs are completed. Please DO NOT include filters, hoods, or other accessories besides the front cap & rear cap. Please do not send your product box. Instead, we recommend wrapping your lens very well in several layers of bubble wrap so that it fits tightly and securely in your shipping box. Our current turn-around time is approximately 3 business days + shipping, depending on the volume of lenses that we receive at the same time as yours. If you have any other questions, please don't hesitate to contact me!

Regards,

Pamela Follett

Customer Service Supervisor

Tamron USA, Inc 10 Austin BLVD

Commack, NY 11725

Phone 631.858.8400

Fax 631.858.8462

Ifthe screws in both the metal flanges on camera body and lens a firm - and that is what I seem to read in your posts - it can be only the bore in lens flange which is at fault. The pin in the camera flange would not allow +/- 1.00 mm play. So the lens must be at fault.

These issues are easy to understand, easy to check. If you do not follow the suggestions, you are simply wasting time, yours and mine. That is all. Why would that cause any hurt ? Most of mankind would be crying, eh ?