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04-26-2013, 09:25 AM   #1
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Vivitar teleconverter 2x-22

I found a Vivitar 2x-22 teleconverter at a local thrift store ($3) in good (perhaps excellent) condition. It has a Pentax rear cap on it, and a Vivitar front cap that has a PK marking. However, when i try to mount any of my lenses, they will slip in to the unit, but will not rotate or lock into place. I can't figure out what i am doing wrong and would love some guidance/input from the members. Also, does anyone have any feedback on how good this model it? Thanks. Any help would be appreciated.

04-26-2013, 09:36 AM   #2
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Join Date: Feb 2009
Location: Alameda, CA
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I think this will help solve the installation problem -> link.

About image quality: I think you will be disappointed. But $3 is a good price, just give it a try. If you don't like to use it as a TC, you can remove the glass and make it an extension tube.
04-26-2013, 11:29 AM   #3
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Here is a test shot with the Vivitar 2X-22 on a 50 mm lens at f/11
As you can see, a lot of sharpness is lost.

https://www.box.com/s/t8g85otu6ds2ekiz3my4
04-26-2013, 05:10 PM   #4
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Join Date: Mar 2010
Location: Frankfurt am Main
Posts: 1,045
I used this back in the eighties.
It was the best of the affordable ones (I had checked the tests in German photo magazines).
I think the original Pentax of that time was 4x the price.

This one is a much simpler design than the Pentax, and also than the more expensive Vivitar ones.
Just 4 lenses in 2 groups, compared with the 7 lenses of the better designs.

I remember there was some reduced resolution, but VERY MUCH reduced contrast.
I think I had the best results not adding it to tele lenses, but to 50mm primes. It saved me taking a bag with me for a tele lens or a zoom, because it fittet easily in the pocket of my shirt.
Using it with zoom lenses of that time, the results were just too bad.

04-26-2013, 05:54 PM   #5
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Join Date: Mar 2010
Location: Frankfurt am Main
Posts: 1,045
QuoteQuote:
I think this will help solve the installation problem -> link.
As far as I remember, my copy of this TC did not have a flange at all.

To the OP:
Are you sure the aperture actuation lever is not bent or otherwise damaged?
Without a protecting flange, damaging can easily happen.

EDIT: Can you send a picture of the TC mount (lens side)?
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