Despite not being a fan of teleconverters I always seem to be in posession of at least one. Early on I had a Vivitar 2x tele, the less said about this the better, bud it was adequate for the use I gave it.
I later bought a Teleplus MC7 2X this was much better and gave very good results (for a tele) with my K 300mm f4, it was KA fit and also worked nicely with Pentax-A 70-210 f4 zoom, results always seemed better with the primes than zooms though. Even wide open the 300mm f4 was very acceptable even beyond 10" x 8" Currently I have a SMC Pentax T-6 2X - results are quite pleasing with Pentax- M 200mm f4 & 135 f3.5 but I would recommend stopping down 1-2 stops to keep the edges sharp (recommended in the instruction sheet). I think the Teleplus has the edge on this! Also a Sigma 1.4 EX APO which I use regular with a 300mm f4 Sigma APO lens, results are a revelation with this lens for a Teleconverter. I believe it also works well with the 70-200 f2.8 hard to tell the difference in prints whether you're using the converter or not. Should work well with Pentax lenses but I'm not sure about compatibility and proximity to rear elements on some lenses. Seriously recommended all the same, never found anything better but then again it is 1.4X and not 2X!!! Recently purchased a Pentax-A 2X-S only had it about a week so I haven't got around to trying it yet. It looks very impressive, largest rear element I've ever seen on a 35mm 2X teleconverter. The instruction sheet makes no mention of stopping the lens down for optimum rersults, sounds promising?! Completely different design from T-6 2X, I'm wondering if it will manage better performance than the Teleplus which was quite remarkable for an aftermarket job. Plan to give it an outing with my Pentax-A 200 f4 at some point. Hope this is of some help. BTW I would love a scan if that is not too much trouble please. John Whittingham Technician ---------- Original Message ----------- From: Sylwester Pietrzyk <[EMAIL PROTECTED]> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Sent: Mon, 05 Jul 2004 14:35:49 +0200 Subject: Re: Quality of pentax teleconverters. > on 05.07.04 6:25, Verge Scott at [EMAIL PROTECTED] wrote: > > > So has anyone seen any tests of the pentax ones? > I've seen that in German Foto Magazin - AFAIR they have been rated much > higher than anything from Sigma or Tamron (something like 9.6 vs. > 8.4 for optics of respectively Pentax and Sigma/Tamron TCs). Both > Pentax TCs have been similar in quality to their counterparts from > Nikon or Canon. If you want, I can send you a scan of full table > with summary from this magazine. > > -- > Best Regards > Sylwek ------- End of Original Message -------
