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03-19-2010, 09:42 PM   #1
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Pentax 1.7X AF Teleconverter with Sigma 100-300mm/4?!?!?!

Would anybody know if Pentax AF 1.7X Teleconverter would work well with Sigma 100-300mm/4?
if so, would you post a few pictures?
or do I have to test it out after I get my 1.7X TC? lol

03-20-2010, 02:04 AM   #2
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Buy the TC and have fun with it. I guarantee you can easily resell it if you don't like it. Check with PF member tom1803 for a new one at a fair price.
03-20-2010, 03:01 AM   #3
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Such combo works *very* fine.
You have to isolate some TC's pins to have correct exposure.

-- M.
03-20-2010, 04:04 AM   #4
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When I tried the 1.7x afa on the sigma 100-300mm f4 I used the aperture ring because the lens didn't close down to where it should have. Maybe this causes the exposure error? For example I like to use f5.6 alot, but the lens would show f2.8 wide open (IIRC) and stopping it down 3 clicks it would still shoot wide open (i discovered this by looking into the lens with DOF preview) until you got to around f8. It worked fine with the aperture ring though. Maybe others didn't have this problem. I used mine with the kenko 1.5x shq and that was a very good combo.

03-20-2010, 11:14 AM   #5
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Thanks, yall! I've just bought the 1.7X converter from Tom, it should arrive today or next Monday, I've gotta try it out. Well, I supposed that I can use it with my FA* 80-200mm as well, mine be a better fit(performer).
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