Sigma 120-300 f2.8 OS HSM and film

Started Apr 16, 2013 | Questions thread
mike clemens
Regular MemberPosts: 118
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Re: Sigma 120-300 f2.8 OS HSM and film
In reply to Skip M, Apr 18, 2013

Canons says about their new series III extenders:

The new Series III Extenders are compatible with all EOS Digital SLRs as well as the EOS-1V 35mm SLR. However, they cannot be used with other film-based EOS cameras because their signal relay system is not compatible with those models.

So I suspect that is the same reason.

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