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Hi. I get error messagne "no lense attached - shutter locked" on my Alpha 200 camera as I try to shoot a photo. Lens is Sigma 28-300. This as worked always since new in 2008. Any advice.
Best regards
Eivind
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Hi, No quick fix on this one. Could be a shutter or antishake problem. Has the camera received impact? Contact Phototronic for pricing www.phototronic.co.nz
From working with third party lenses in the past what I've found is that Canon doesn't give up the "chip" technology so the older lens can not talk to the newer cameras. I suspect that Canon does this to promote their lenses over the competition. You might be able to send the lens to Sigma and have them re-chip it and have a great lens again.
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
To NOT get that error you need to use in AV mode.
It's the only way that old Sigmas work with the new Canons.
It's an aperture bug that old Sigma lens have and some the only way to fix it is to rechip it. The problem is that Sigma no longer rechips the lens.
Unfortunately, there are electrical differences between early and later Sigma lenses. Although the bayonet connection is the same, and the lens can fit, it will not necessarily connect electrically with the connections on the camera. Sigma can modify the lens for you, but this can be quite costly, and you may be cheaper to look for an alternative lens.
It seems that you may have an older sigma lens which does not have the appropriate electrical connections. Sigma can modify this for you if you contact them, and I believe the cost is reasonable. Although some lenses look very similar, there are electrical differences between earlier and newer lenses, even though they may fit on to your camera mechanically,
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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