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03-04-2008, 01:05 PM   #31
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QuoteOriginally posted by John Kovarik Quote
Here's my (unprofessional) update: I now have the Kenko 1.5, Tamron 1.4, and PTX 1.7, all AF
version. My assessment is the Kenko is very good in consistent performance on a wide range of glass and IQ is in the upper range of acceptable. The Tamron is excellent in all respects espceially when on my Tamron 18-250. The PTX is the 'fussiest' lens-to-lens, but I have had it only a couple of days. Right now it is on a K135/2.5 (K100D) and its 'final focus' peformance is superb - fast and dead on. Though I think the Kenko is surely the best $ value, the other two will get far more camera time. And that's all I have to say 'bout TCs........(8- )
John

by this do you mean that the tamron and kenko can provide autofocus function to MF lenses, like the pentax one.

ALso the reason pentax may be fussiest lens to lens is because you have 2 focusing elements, one in the lens and one in the AF TC both trying to do th ejob

03-04-2008, 04:39 PM   #32
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if you want an impression of what a sigma 2x TC can do, click on the link below

https://www.pentaxforums.com/forums/187646-post19.html
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