Well after a week in the shop it came back working. the guy at the shop could only tell me that the repair people had fixed a problem in the auto focus (he had no other information). So the solution here is going to a place to repair your lens. if someone finds the cause of this problem it would be great
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Unfortunately this is a risk when you use third-party lenses. The camera manufacturer's lens to body protocols are not open source nor do they licence the technology to alternative suppliers, so all that companies like Tamron can do is to try and reverse engineer the system.
You only have two possible fixes:-
1. Replace the lens with a Sony Alpha model; or
2. Contact Tamron to see whether they offer an update service for your lens.
The latter is certainly possible with some brands/models, but the costs have historically varied between "you pay just the shipping and handling" right up to "it's cheaper to buy a new lens".
So you either pay a high price for Sony Alpha genuine lenses which are guaranteed to always work with Sony Alpha bodies and firmware updates, or pay repeatedly for third party lenses. "You pays your money and you takes your choice".
Sigma makes their lenses with a variety of mounts. A lens with a Canon mount, for example, will not fit onto a Sony camera. Assuming you get the Sigma lens with a Sony mount then yes, it will be compatible with the Sony alpha.
The Sony ALpha camera actually use a Konica/ Minolta lens mount. a 500 or 1000mm lens won't have any really mechanical connection to make, so if you can find the lens with a Minolta mount , it should fit. BTW- most of those long lenses require a T mount adapter to fit on ANY camera-
I took the following off of the Alpha website
"Sony Alpha lens mount Identical to the Minolta A-type bayonet mount, enabling the use of a large back catalogue of existing Minolta and third party lenses"
I know that the lenses that fit my son's Maxxum will not fit my non-Maxxum Minolta bodies. VERIFY THAT THE LENS YOU WANT TO MATE TO YOUR SONY HAS THE MINOLTA A-TYPE MOUNT.
That lens was made for minolta cameras. and it would need to be whats called. "Re-chiped"
if you get a hold of the company that made it then they usually do it for free. If they still have parts.
So what happens is. even though it is an auto focus lens. It wasnt set up to work with sony.So you jsut need the lens and camera to speek the same language in theory.
If you took it to a camera store they should beable to help you get in contact with the company.
Usually mounts are unique to a camera manufacturer. There are exceptions. Sony has the Alpha; lenses for the Konica-Minolta are the same mount. Your AF (autofocus) lens will work on it. You might also consider picking up a Konica Minolta 5D or 7D.....they're no longer made and hence are cheaply had.
The MD and Rokkor lenses won't work on the Sony Alpha.
THIS IS A CHEAP LENS (<$50 VALUE) SO I WOULDN'T LET IT DRIVE YOUR DECISIONS!!