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

Started Mar 10, 2014 | Discussions thread
Regular MemberPosts: 426
Re: HD DA TC x1,4: no Sigma HSM; not making FF compatible
In reply to Barry Pearson, Mar 13, 2014

Barry Pearson wrote:

beholder3 wrote:

Just to confirm two items:

  • <snip>
  • 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.

That doesn't appear to be true for the Pentax 1.4 Teleconverter.

You are right. I havent updated my post here later.

I tested with DA 15 and Sigma 8-16 and both hard vignetting came from the unlucky combination of either fixed hood (Sigma) or not fully retracted hood (DA 15) combined with the fact that the adapter mounts the lens somewhat turned to the side so the petal shaped hoods come into sight.

Even the K50/1.2 works fine as does the DA 15. See http://www.dslr-forum.de/showpost.php?p=12056039&postcount=129

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