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10-23-2009, 05:03 AM   #1
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Vivitar PKA TC problem

I just got a Vivitar 2x TC from eBay, and I tried it with both my FA50, a Vivitar PKA 28mm and my DA50-200. It doesn't get aperture data from either lens, it just shows the "F--" as if using an all manual lens.

Is there some setting or something I missed, or should I prepare a return? I cleaned the contacts without any signs of improvement.



(It works ok as a manual TC, especially with the FA50. But well... it would be nice to get what you pay for.)

10-23-2009, 05:35 PM   #2
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Unfortunately I think you missed something.

I think there are six levels of teleconverter for Pentax:

1/ Basic (PK), just magnifies.

2/ Auto (APK), can control auto stop down (like with 'M' lenses).

3/ With contacts (PK/A, KAX) allows the use of the 'A' position on 'A' lenses.

4/ With contacts + AF (PAF?) as above + autofocus

5/ With contacts + AF + powerzoom contacts (PZ-AF) as above + in lens autofocus

6/ PENTAX F AF 1.7X ADAPTER as above + autofocus on manual lenses


I don't think any get aperture data back from the lens (maybe the Pentax F but I don't know).
10-23-2009, 06:49 PM   #3
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It is a..
QuoteOriginally posted by alfa75ts Quote
3/ With contacts (PK/A, KAX) allows the use of the 'A' position on 'A' lenses.
If I understand correctly, a FA or DA lens connected with that teleconverter should act as an A lens with 2x the FL on a K20D?

Anyway, someone over at dpreview kindly directed me to this thread.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/28446-just-rec...tml#post493608

So I think it might be time for some surgery...
10-23-2009, 07:40 PM   #4
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QuoteOriginally posted by wowtip Quote
If I understand correctly, a FA or DA lens connected with that teleconverter should act as an A lens with 2x the FL on a K20D?
Yes, just like an 'A' lens. When the lens is in the 'A' position the camera will control the aperture
and when it is not, the camera will display F----, will measure the light and adjust shutter speed/ISO.

QuoteOriginally posted by wowtip Quote
So I think it might be time for some surgery...
I don't think surgery will change anything.

10-23-2009, 08:02 PM   #5
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Ok, but it gives the F-- also with the lens in A mode?
10-23-2009, 08:12 PM   #6
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QuoteOriginally posted by wowtip Quote
Ok, but it gives the F-- also with the lens in A mode?
Then I think there's something wrong.
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