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tele converter lenses

I am at odds to find a suitable tele converter lens for my Pentax MZ60. Is there a lens made that enables the auto focus lens attached to the tele converter or does this function only work in manuel. I tried a vivitar PK-A/R-PK but this did not work well at all

brian gardner
Sat Aug 14 19:44:15 PDT 2004

What lens are you using with the Pentax MZ60 camera and the Vivitar PK-A/R-PK teleconverter?

The Vivitar PK-A/R-PK is a 2x teleconverter. I suspect you are probably using a lens with maximum aperture of f/5.6.

2x teleconverters generally add 2-stops of light loss to your lens. So a f/5.6 lens becomes a f/11. Most camera bodies cannot auto-focus at f/11. Usually they need at last f/5.6 to auto-focus.

In order to auto-focus with your camera and a 2x teleconverter, you will need a lens that has a maximum aperture of f/2.8 or bigger.

Chieh Cheng
Mon Aug 16 13:50:58 PDT 2004

Thank you for your quick reply and enlightening answer. The two lenses that I am using for the MZ60 are
[1]A sigma Asperical 28mm-90mm f/22-3.5
[2]A sigma zoom 100-300mm f/32-4.5
what you say would be quite valid for these lenses and would only work in manual mode with a 2x or 3x tele converter lens

brian gardner
Fri Aug 20 17:57:34 PDT 2004

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