Jirej Productions Ltd
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Jirej Productions Ltd reacted to BTM_Pix in The right Sigma 18-35mm for my Metabones Spedbooster Ultra
Its definitely an SA mount.
If it is a used one and you can't get a refund/exchange then you will be able to sell it on without too much loss as it is a very popular lens for SD Quattro owners.
Sigma themselves offer a permanent mount change service but the price of this went up not so long ago and it is now more expensive than any loss you'll take selling it and re-buying another used one in EF mount.
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Jirej Productions Ltd reacted to KnightsFan in The right Sigma 18-35mm for my Metabones Spedbooster Ultra
It looks like your 18-25 might be a Sigma SA mount lens, perhaps mislabeled as Canon EF by the seller.
(Based on looking up pictures of lens mounts, I don't actually have the lens in SA mount)
I found this page which has a detailed pic of an SA mount http://conurus.com/forum/sigma-sa-mount-thread-t266-15.html?sid=90c0074805e17063cfbc549a5315e1b0
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Jirej Productions Ltd reacted to kye in The right Sigma 18-35mm for my Metabones Spedbooster Ultra
This is the mount for my 18-35...
Not sure if that helps...