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12-25-2008, 10:43 AM   #1
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teleconverter question

A friend of mine was clearing out her grandmother's storage space and sent some stuff up for my kids to play with (she's weird, bear with me).

One of these things is a Vivitar 2X macro-focusing teleconverter, which says it is for a Pentax/Ricoh mount. The bottom of the box says 1987.

I have never used a teleconverter and know nothing about them. It seems to be in like-new condition. Can I use this with my K100DS?

Thanks for your help.

12-28-2008, 09:07 PM   #2
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sure can !! I have used a CPC teleconverter with decent results. you will have a bit of image quality loss, and lose two stops, but if you need the reach, they are nice to have..

here is a moon shot I took with the 2x teleconverter, and a vivitar 400mm lens, fully manual exposure, took several test shots to get the exposure close, but decent results for me

12-28-2008, 09:45 PM   #3
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Here is an old thread, but some great info.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/19694-tamron-t...rter-pics.html
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