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03-11-2010, 10:33 PM   #1
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A growing list of Compatible lenses

After recently buying a Pentax 1.7 TC AF (Thanks again Tom) and after reading all the compatible lenses that are suitable,I was wondering from all members here which lens apart from the list, does work.I see on another thread that the DA*300 f/4. works well enough, any others.......


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03-11-2010, 11:29 PM   #2
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Pentax tele converter

My understanding is that you manually get the focus close and then use the tele-converter to fine tune the focus.

Correct?

In your view how accurate/good is this item. I have never tried nor know anyone who has used a tele-converter
03-12-2010, 05:32 AM   #3
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This TC does in fact Auto focuses the M lens simply set to infinitely and manually focus near and the AF takes over brilliant TC but it does have limitation ,really only for fast glass up to f/4.But also what to find out on how many other AF lenses it works with,eg anyone uses it on a Sigma 100-300 f/4 or Sigma 70-200 f/2.8 with HSM drive


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03-13-2010, 01:49 AM   #4
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I have tried the Pentax TC 1.7 on the Sigma 100-300 f/4 and in the viewfinders its displayed f/2.8 and wont fire,also on a side note when I removed the sigma lens off and was in AF mode moving the focus ring it sounded rough sound not so much in MF


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