20 Most Recent Sigma AF 28-200 Lens Questions & Answers

If you take it to pieces, you will end up with a (hopefully complete) kit of parts which you will have to pay a repairer to re-assemble for you. Your choice.

Why should it have a AF-M switch? most DSLR's have the switch also on the camera body. Just tell us what camera you have and I look f and where it has the possibility to switch between AF and M

That cord may have been a gasket for sealing the lens from dirt.

Sigma makes their lenses with a variety of lens mounts. If your lens has a Sony mount then yes, it will fit your a330. If has, say, a Canon mount, then no, it will not fit.

dos the manual focus work

If you are useing on a digitel canon it may work inside were it is
darker it needs the iris fully open but outside it need to close down if canot close down it will give a err99 it would need a rechip sigma in the UK can not do this anymore

What fit is the lens

Hi
To test if it is compatible put the lens on the camera set to AV and the iris to f16/22 use the stopdown
button if it stops down works you ok but if not it would need a rechip but that no longer avabile best
call sigma

send me a email to [email protected]

Hi It sounds as if the scale ring has gone ie needs a new one are you uk

All auto-focus lens have some sort of 'chip' inside .. Sigma 'reversed engineered' Canon's chip - however every time Canon brings out a new camera there is a chance the Sigma lens chip won't work (this is why you see lots of Sigma lens on eBay :-) )

IF you can prove you purchased your lens direct from an authorised Sigma dealer, Sigma will update the chip for free .. otherwise they charge about £35 .. you pay postage in both cases ..

Visit the Sigma web site for further info.

The front elments is a sealed unit so I think it must be the back elements you need to no how the fit what size filter is un you lens is a hyperzoom .

Sigma cannot rechip your old 70-200 2.8 call sigma uk and see what thay can offer on 01707329999

What camera are you using is the lens making a noise when it stops focusing  call sigma imaging uk 01707 329999

I do not think it worth it the big problem apart of the mount is that the iris is worked by levers on the minolta and the Canon has a small motor to drive the iris best is to sell and get a canon fit 

It is not normal for the focus ring to move slightly when using autofocus mode on the Sigma 70-200mm f2.8 APO EX lens. This could be caused by a problem with the lens or with the camera body. One thing you can try is to check if the lens mount on the camera is clean and free from debris, as this can cause the lens to move when the camera's autofocus system is trying to adjust the focus. You should also check if your lens firmware is updated to the latest version and make sure your camera firmware is also up to date.

You can't do this yourself. It needs to be carried out by professionals and is a 'clean room' with service techs in full dust proof protective wear. Send it to them. https://www.sigma-global.com/en/support/ ..

Question edited for clarity. You get the Sigma lens for the camera in Canon fit. https://www.google.com/search?q=sigma+lens+af+75-300+for+canon+rebel+xti Can you use Sigma lenses on Canon cameras? Since Sigma lenses are made to be fully compatible with Canon cameras, they are backwards-compatible. This means that you can use a Sigma lens on a Canon DSLR camera. Similarly, the Sigma cameras are backwards-compatible with Canon lenses. Macro adapter loses the AF feature. https://www.google.com/search?q=sigma+lens+af+75-300+mount+adapter+ring+for+canon+rebel+xti

Taking it apart is not the problem - re-assembling it will be. Unless you have access to an optical laboratory, where laser instruments can measure the exact tolerances required, don't even think about it. You will be left with a pile of optical components, and a far higher repair bill than if you had just let the experts sort out the problem in the first place.