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01-06-2011, 07:42 AM   #1
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Which teleconverter - Kenko 1.5x or Pentax 1.7x for DA* 60-250?

Does anyone have experience with these teleconverters and DA* 60-250?

Kenko 1.5x Pz-AF
Pentax 1.7x AF

Which one will result in better IQ?
Which one will focus faster and/or more accurate?

I do not have any manual focus lenses. The TC will only be used with the 60-250, or with other long telephoto lenses that Pentax might release in the future.

Any advice will be much appreciated!

Sergey

01-06-2011, 09:09 AM   #2
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QuoteOriginally posted by Kammerer Quote
Does anyone have experience with these teleconverters and DA* 60-250?

Kenko 1.5x Pz-AF
Pentax 1.7x AF

Which one will result in better IQ?
Which one will focus faster and/or more accurate?

I do not have any manual focus lenses. The TC will only be used with the 60-250, or with other long telephoto lenses that Pentax might release in the future.

Any advice will be much appreciated!

Sergey
Pentaxiani, il forum: Leggi argomento - Star e duplicatori

Hello, if you log, you will see the photos
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01-06-2011, 12:18 PM   #3
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QuoteOriginally posted by bollicina31 Quote
Pentaxiani, il forum: Leggi argomento - Star e duplicatori
Thanks much for the link, bollicina. If I understood the translation correctly, they have tested Kenko 2x TC, and it did affect the IQ noticeably. I would not want to use a 2x TC anyway - I doubt K-7 will focus well with it.
01-06-2011, 01:03 PM   #4
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Kenko 1.5x Pz-AF focus slowly with the camera

Pentax 1.7x AF has semi manual focus-you focus aproximatly to the obgect-and all the changes in focus are faster than with kenko tc

01-06-2011, 01:44 PM   #5
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QuoteOriginally posted by koper Quote
Kenko 1.5x Pz-AF focus slowly with the camera

Pentax 1.7x AF has semi manual focus-you focus aproximatly to the obgect-and all the changes in focus are faster than with kenko tc
Correct. I never used the Kenko, but the Tamron 1.4x Pz-AF is very similar. It will focus the DA*60-250, but it is very slow and often won't lock on the first try. The 1.7x AF-A requires a rough manual focus, but is pretty quick otherwise. For most applications, you can preset the focus closet to infinity and you'll have the majority of the focal range covered by the AF-A. If most of you're shots are of similar distance away (say 10-50m), you likely wouldn't have to manually focus at all and could just use the the 1.7 to do all the focusing.
01-06-2011, 02:39 PM   #6
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Thanks, koper and dgaies. Sounds as if I would be better off with the Pentax 1.7x AF.
01-06-2011, 03:12 PM   #7
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I'm pretty particular about IQ. I've recently tested a few TCs, and all of them degraded the IQ, except the Pentax. I'm still testing it, but so far I can see no degredation when used with my DA*200, which surprised me. Another surprise was that the AF is actually a little faster and more accurate with the TC than without it. I'm shooting a K20D, by the way.
01-06-2011, 04:09 PM   #8
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QuoteOriginally posted by Ron Kruger Quote
I'm pretty particular about IQ. I've recently tested a few TCs, and all of them degraded the IQ, except the Pentax. I'm still testing it, but so far I can see no degredation when used with my DA*200, which surprised me. Another surprise was that the AF is actually a little faster and more accurate with the TC than without it. I'm shooting a K20D, by the way.
Ron, that's very good to know, thanks.

01-06-2011, 08:12 PM   #9
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You're welcome Kammerer. I suspect the reason the AF is better with the Pentax TC is simply that it confines the view to a smaller areas with fewer contrast areas to confuse it. The simpler the scene the better AF works.
01-06-2011, 09:59 PM   #10
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i agree 100 percent with dgaies
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