I am trying to use an older SIGMA 28 - 200 mm f3.5 - 5.6 DL Hyperzoom macro Aspherical AF lens with a Canon Rebel Xsi and am getting a communication error (Err 01).I have already cleaned the lens contacts but still get the same error code after pressing the shutter

Sigma produces lenses for different brands of camera's. The optics are the same, but the connection differs from brand to brand. So if you have a Sigma lens for Nikon, you won't be able to use it on a Canon or Sony. Unless you buy a adapter. But when you start using an adapter, you will lose the Af in most cases, because the electronic in the lenses differ also. and that can't be bridged.

Yes.

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.

This lens can work with 5D mark II ?

Yes, if you get one with a Canon mount. Sigma makes their lenses available with a variety of mounts; a lens with a Nikon mount, for example, will not fit on a Canon camera.

If it has a canon mount it should work fine

Hi It might work the way to test is to fit it 2 the D60 set the camera to av and a iris of F16/22 use the stopdown button if the lens stops down your ok if nothing happens it will need a rechip but I think the the rechips are no longer avabil

You may be able to find an adaptor, but I doubt it and you would lose many functions in any case. It could end up that the lens will not auto focus or that it would not meter properly. These adaptors are made so that specialty lenses (such as fisheye or shift lenses) can be mounted on cameras when needed. Your 28-200 would probably be cheaper to by in an EOS mount.

In the uk if you have a receipt from new it will cost £5 But no receipt or second hand it will cost £33.99

if the lens is the older type with a macro switch which has 2 screws holding it on to the lens it will not work.If it a super 70-300 you can put the camer on AV set iris to F22 if you have a stopdown button see if the lens stops down it ok if noe it will need a rechip or a new interuper