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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.
Sigma makes some lenses for Nikon cameras-- though the Nikon D40 requires a lens with its own internal focusing mechanism, since it does not have an autofocus motor. This entirely depends on what Sigma lens you have, i.e. if it were a Sigma lens made for a Canon camera, yes there would be an adapter for that-- but the likelihood of success is less with the limitation of the D40 needing an internal focus motor on the lens.
Assuming you get the lens with a Canon mount, yes. Sigma makes lenses to fit a variety of makes, but each one has a different mount. A lens intended for a Nikon, for example, will not fit a Canon.
According to Sigma, your lens should be fully compatible with your camera although there will be the usual 1.6x crop factor as the lens is designed for a full frame sensor. This would not cause your Err 01 fault though so you should return the lens to your dealer for refund or exchange. Failing that, consider claiming on Sigma's one year international warranty. The warranty is ONLY valid if your lens was supplied with the Sigma Warranty card. All new Sigma lenses supplied through official resellers include the Warranty Card. You can find more details about where to send your lens for a warranty repair by clicking here.
Good luck, and please take a moment to rate my reply.
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 ..
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