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Almost all early Quantaray lenses (and Sigma lenses, Sigma made Quantaray) in the Canon EOS mount will show error messages on Canon digital cameras (but still work fine on older EOS film cameras). usually err99 but err01 also. There is no DIY fix and Sigma ran out of update parts years ago. Current production lenses and Canon made lenses will not have this problem. This lens would only work for someone shooting EOS film cameras with no intention of "upgrading" their system to digital Canon cameras in the future.
Getting functionally useful adaptors from any other brand to Canon EOS is difficult as the register distance from the sensor to the lens is the deepest of all current lens mounts. Adaptors therefore require expensive optical correction in order to preserve infinity focus ability and given that the adapted lens will still be substantially crippled most owners aren't prepared to pay for such an adaptor. In any case, the additional optical elements will reduce optical quality.
Due to similar electronics, it is possible to physically convert a Sigma mount lens to EOS by fitting an EOS lens bayonet but it's a skilled job requiring fabrication skills and even then there's no guarantee that the lens will communicate correctly with all EOS bodies. In practice, due to the scarcity of Sigma mount lenses the conversion is usually the other way around.
Canon EOS 500N has an EF lens mount, so all lenses with Canon EF mount will fit. All lenses with MF and EF-S won't fit. If you purchased Sigma 28-70mm f/2.8 EX, then it have EF mount and will fit EOS 500N.
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
Is the 28-70 a DF type if so it will work on a canon
DSLR but if its the older one with the scale ring is
on the outside of the lens it will need a rechip but I think thay are no longer avabile the 70-300 if is a super
it will work or need a rechip if its a older one with a macro switch held on the lens with 2 screws it to
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