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I just got a SIGMA 17-70 1:2:8-4 DC (C) lense. Mount looks very much like Canon EF (S) but it's smaller. Added a foto from a 70-200 EF to compare. Anybody knows what this mount is for? Many thanks in advance

Sigma measure

Canon measure

Sigma Objectiv Image1

Sigma mount Image1

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  • could it be a sigma SA mount?
    – Patrick
    Feb 3 '20 at 21:42
  • EF-M perhaps? Its 47mm throat diameter looks similar to your measurement
    – Nate S.
    Feb 3 '20 at 21:42
  • that's what I thought first but SIgma says on there webpage it would be only available for: Canon EF-Mount, Nikon F-Mount, SIGMA SA-Mount, Pentax K-Mount, Sony A-Mount
    – Patrick
    Feb 3 '20 at 21:53
  • SA seems likely then. Take a look at the linked picture from the comment on this answer; does that look like what you've got?: photo.stackexchange.com/questions/65303/…
    – Nate S.
    Feb 3 '20 at 22:15
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    @NateS. This discussion in comments is a good example of the site's guideline: Please put your answers in the answers section, even if they're short
    – scottbb
    Feb 4 '20 at 2:43
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Thanks @Nate S. for his answer.

This looks like the same thing, so yes, SA: https://www.worthpoint.com/worthopedia/sigma-17-70mm-2-4-macro-dc-sigma-sa-1791976047

Solution is Sigma SA Mount

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  • Sigma SA reportedly uses the same communication protocol as Canon EF, which explains why it looks like an EF mount from an alternate universe.
    – xiota
    Feb 4 '20 at 3:48
  • IIRC you have have the mount changed by Sigma service. Nice lens, that's my "standard" one. Just a bit soft at 17mm.
    – xenoid
    Feb 4 '20 at 10:25

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