HD DA TC x1,4: no Sigma HSM; not making FF compatible

Started 6 months ago | Discussions thread
beholder3
Regular MemberPosts: 275
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Re: HD DA TC x1,4: no Sigma HSM; not making FF compatible
In reply to james45, 6 months ago

james45 wrote:

beholder3 wrote:

Just to confirm two items:

  • The new TC does not work with 3rd party Sigma HSM driven lenses
    tested on 70-200/2.8 OS and only focussed to infinity nothing else; 85/1.4 not working at all. Even FNumbers are not converted for these lenses (while oldies like FA 24-90 do show converted FNumbers)
  • While in theory a TC would convert the FoV to make APSC lenses FF-compatible in practise they dont, due to the fact that the lens system in the TC has such a small diameter and you get hard black vignetting all around. Tested with some lenses on 5D3.

Other than that the TC is a little jewel with DA* 300, DA* 60-250 and DFA 100. And that is what it is intended for.

How is it with non HSM Sigma lenses? Keen to know if it behaves with the 100-300 f4...

Sigma 180 Macro and 105 Macro seem to be doing fine. Looks like screw-driven lenses are fine and only HSMs dont work. On the latter not only FNumbers but also focal lengths are not converted. Seems a Sigma issue.

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