Vivitar 7 Element 2x Tele Converter for Pentax

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About Vivitar

The Vivitar 7 Element 2x Tele Converter is compatible with Pentax cameras. It increases the focal length by 2x. It has anti-reflection coating.

Vivitar Specifications

Pentax Cameras
Focal Length
Up to 2x
3.50x3.25x3.25" / 8.89x8.25x8.25cm
0.60lbs / 0.27kg

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Questions about this item:

MARK S  Will this teleconverter work on a K10D auto focus camera?
JOHN J  Should be no problem. I haven't tried it with my K10 (I gave it to my son to use) but it should work fine. The bigger concern you should have is what lens are you using it with. If contrast and lighting is good it seems to work with even my slow lenses. But it truly excells with a fast lens of mine - Tamron 28-75 2.8, even when it is stopped down far beyond 4.0. I believe that is because most fast lenses are also a higher contrast lens.
MARK S  John I have a Sigma 150-500 telephoto
Lincoln S  Does this lens fit a Pentax K3 and is it manual focus?
VERNON P  I have used this on both my K2000 and K5 and the auto focus works quite well. No reason why it should not work on your K3.
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