Tight Bigma mount

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Kendunn Contributing Member • Posts: 874
Tight Bigma mount

I purchased a used Sigma 50-500 OS version for Canon off eBay and tried to mount on a brand new 5Ds and it got really tight about half way on.  I of course didn't force and tried it on my old 5D and it went on but required way too much force to get both on and off. Tried other lens on both and all was good. I'm thinking where it's such a big lens the flange is slightly bent out something, any known issue?

I messaged the seller and he said it was used on a Red camera but it had been a while (and he refused to let me return although eBay will take care of it).  At this point not sure if anything to do other than return it or send in for repairs, ideas?  The mount looks clean and can't see any issue, but of course we're talking thousandths of an inch here.

Canon EOS 5DS Sigma 50-500mm F4.5-6.3 DG OS HSM
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