bnsf

Need help from you camera people out there. The problem I am having is with my Tamron 150-600nn lens. The lens has a auto focus motor. When the lens is attached to my Sony a77M2 camera I cannot hear or feel the auto focus motor in the lens operating when I press the focus button on the top of camera. This is the only lens that is giving me problems. Could it be the the electrical tabs from the camera are not touching the lens contacts and that I may need an extension ring to make these contacts touch each other,

If anyone else has been experiencing the same problem I have been please let me know what you have done to correct this problem. All my other Sony Lens the auto focus works just fine.

Have tried a Minolta and a Sony 500mm autofocus lens and still having the same problem. This is really bugging me and I would live to correct this problem for good. This is why I am asking for your help. Thanks.

tinplater Loc: Scottsdale, AZ

I would take your camera and lens into a camera shop and let someone with repair experience go over the camera and lens.

RWR Loc: La Mesa, CA

Is the lens auto focusing OK?

RonnieP Loc: Texas

Try contacting Tamron and seeing if the warranty is still in effect. Sounds like a lens problem.

Morning Star Loc: West coast, North of the 49th N.

bnsf, while I don't have that lens myself, the first thought that popped into my head was "does that lens have an on/off button for AF?" Went and looked it up on the internet, and while I didn't find anything about a button, on the B&Hwebsite ( http://www.bhphotovideo.com/explora/photography/hands-review/hands-review-tamron-150-600mm-f5-63-sp-di-vc-usd-canon ) I found the following statement:
"The 150-600mm f/5-6.3 was tested with a Canon 5D Mark II, and definitely proved to be an impressive piece of glass. The speed of its AF system (an Ultrasonic Silent Drive motor) is easily comparable with those equipped with Canon and Nikon’s high-end glass, kicking into action in a snap. It’s incredibly smooth, silent, and fast every time."
With that statement, I would be more upset if I could hear or feel the motor working.

As someone else asked: "Is the lens auto focusing OK?"
If so, I'd say that everything is well, and you're worried needlessly.

bnsf

The only focus is by me doing it. Auto focus is dead.

MT Shooter Loc: Montana

The lens has Tamron "Ultrasonic Silent Drive" AF motor. You say you cannot HEAR it, but you don't say whether or not it is actually focusing. Watch your distance scale window when half pressing the shutter button to see if it is focusing. If not, check the AF switch on the left side of the lens and make sure it is not in "M" for Manual focus.

David Kay Loc: Arlington Heights IL

If you are having the same problem with several lens' on the same body I would suspect the body is the problem. I would take all to a camera repair and have them checked.

bnsf

Have all switch to auto focus. With button pushedchalf way down still auto focus does not operate. Like it is not getting power to the motor.

machia Loc: NJ

I'm thinking it's the camera . Have a camera tech take a look at it .

RWR Loc: La Mesa, CA

OK, that rules out a dead hearing aid!

bnsf

Would I possibly need a third party adapter to make the auto focus to work? Has anyone else used a third party adapter to make there lens operate properly,

Armadillo Loc: Ventura, CA

bnsf,

The lens you have was manufactured to fit many camera bodies, yours, Nikon, and Canon to name just few. The difference is in the attachment collar for the electrical contacts. If your other lenses for your Sony work fine for focus, you may have a problem with the Tamron lens.

Try this to test your Tamron, attach the camera body to the lens with the normal twist motion, depress the lens release button on the camera body and rock the camera body back and forth a couple of times. This should assure the camera - lens connections are firm.
In the lens you have two buttons, Lock and A/F; Lock, locks the zoom function at minimum focal length to prevent lens creep, A/F switches from Auto Focus to Manual Focus. Make sure the Lock is in the unlock position. Make sure the A/F is in Auto.

Switch camera power off.
Your Tamron lens has what they call USM (Ultra Silent Motor) to drive the focus; you will not hear, or feel the focus in operation.
Temporarily switch the focus to manual, point the camera/lens at some object in the distance, now manually set the lens to show a well out of focus object. Make sure the camera focus metering point is at Center Spot Focus. Set lens A/F to Auto.

Turn camera power on.
Perform the usual pre-focus function (half press the shutter release button). Looking through the viewfinder note if the out of focus object is now in focus.

If you now have a sharply focused object, you have solved your problem.
If you still have no auto focus, try your other menses in the same test, if they fail you have a camera problem, or menu setting.

Michael G

bnsf

I have the same problem when I used a Sony 500mm lens along with a Konica/Minolta 500 A/F lens. Seems like when I put a long focal lens on the camera it does not operate properly. Basically no auto focus.

RWR Loc: La Mesa, CA

Try cleaning the contacts. If you still have no autofocus with any lens, the issue is undoubtedly with the camera. I'd send it in to Sony repair. Good luck!