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02-14-2009, 04:21 PM   #1
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Join Date: Feb 2009
Location: Rome (Italy)
Posts: 16
Promaster spectrum 7 2x auto TC

Hi all,
I've got my first teleconverter: Promaster spectrum 7 Auto TC MC 2x for KPR
I didn't expect AF to function, even with DA lenses, but at least Aperture info to be transmitted to the camera.

I tried with A 50mm lens, but even in A position my K20D didn't read the aperture and display a F--- !
When I use the aperture ring, i can use different values of aperture.
With DA lenses, where aperture ring is missing, I can only shot at maximum aperture of the lens.

This TC has got 6 pins on both sides (as you can see from pictures attached). It has also the leverage for aperture control.

Is it to be mended or is it just a 'full manual' TC ?

Should I get something better, like a Teleplus PZ-AF 2X Tele Converter Lens MC7 or a PZ-AF 1,5x ?

Thanks !

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Last edited by gr8wings; 02-14-2009 at 04:27 PM.
07-03-2010, 08:02 AM   #2
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Join Date: Jul 2010
Location: Dallas - Fort Worth
Posts: 1
Similar issues with MC7

I just added a Promaster MC7 2x teleconverter to my camera gear.

Not sure what's going on. I have a Pentax SF1, K110D and neither work 100% with the converter although the lens work fine without.

On the K110D I can only get lens info if I have the lens in the A setting positio, which is expected, but NO AUTOFOCUS.

On the SF1 (a film camera) I can not get the converter to work at all, just a flashing error in the viewfinder window no matter how it is set.

The teleconverter has a full set of pins or seems to, as opposed to some other that I have seen with less pins.

Figured my results would be the other way around. The lens I was testing on both was a TAMRON 28-200 F3.8-5.6 zoom. Not a DA only lens.

I can shoot manual focus with the lens. Looking for a manufactuer manual on the TC so I can see if there are some recommendations or disclaimers.


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2x, aperture, k-mount, lens, lenses, pentax lens, promaster spectrum, pz-af, slr lens, spectrum, tc
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