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05-07-2009, 04:08 AM   #46
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I was not aware there were so many choices in TCs. I was surprised to see so many cheap ones on eBay. So, going back to a more basic question: What is a good TC for a manual SMC Pentax A-70-210 f/4? I have one of those lenses on its way and I have learned on this thread that not all TCs work well with all lenses. I usually go fully manual.
I would use it with the K100D and maybe also with the K1000 and MV-1 just for fun.
I would like a 2X but I see there are 1.7X , 1.4X etc.
Any suggestions?

Thanks,

05-07-2009, 04:28 AM   #47
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the best choise for the SMC Pentax A-70-210 f/4 is the SMC-F 1.7x AF TC

it is a high quality TC allows all auto functions of the lens to work corectly on a DSLR AND gives limited auto focus function to the lens

what else could you want.

also this will allow the autofocus to work, where as a 2x (but manual focus) will be too dark for AF indication
05-07-2009, 04:38 AM   #48
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Thanks! I'll be on the lookout for it.
This darn LBA...
05-07-2009, 08:23 PM   #49
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I agree that the 1.7 Pentax is a great TC, it's both good optically and does something that no other can in adding AF abilities to a manual focus lens. It's not for everyone though, being as expensive as it normally is - if you can find it cheaply or are not put off by its cost, certainly worth having. Beyond that TC, for a zoom I would generally suggest trying a 1.4x/1.5x before a 2x, optically they're less damaging to image quality, sometimes to the point where it's hard to notice at all. If going for a 2x TC, most recent 2x TCs seem to use either 4 elements or 7, & in nearly all circumstances you should see better results using a 7 element TC.

05-07-2009, 09:13 PM   #50
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I also find the A 1.4X-S works well with the A 70-210/4. This gives you a 100-300/5.6. Not too shabby image quality, either.
07-19-2009, 08:03 AM   #51
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Can you recommend me some 2.0x teleconvertor for my Voigtlander 180? I know that 2.0x TCs aren´t best for IQ, but my Voigt180 is brutally sharp so it shouldn´t
interfere. Maybe Pentax 1.7 AF TC would be a best choice talking about the IQ (I don´t need AF function). What do you think about 2.0 TC. Which one?
07-19-2009, 01:15 PM   #52
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QuoteOriginally posted by aCIDfire Quote
Can you recommend me some 2.0x teleconvertor for my Voigtlander 180? I know that 2.0x TCs aren´t best for IQ, but my Voigt180 is brutally sharp so it shouldn´t
interfere. Maybe Pentax 1.7 AF TC would be a best choice talking about the IQ (I don´t need AF function). What do you think about 2.0 TC. Which one?
Try to get a Pentax 2x-S A-converter. It is the next best thing to the 2x-L converter, which does not fit onto the Voigtländer, because of its protruding lens elements. Another option (but with more IQ loss) is the Kenko MC7 2x-tc A-version. It is visibly better than the old Pentax K6T, but not quite as good as the Pentax 2x-S. I have all of the tcs mentioned and also the 180 Apo-Lanthar.

Ben
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