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11-18-2010, 01:03 PM   #1
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Pentax Auto K Mount teleconverter on Manual K1000 body/lens ?

So, I own a Manual K1000 and I was wondering if an Auto K-mount teleconverter as :

PRO 3X Auto Tele Converter for Pentex - K with Case - eBay (item 130448021982 end time Nov-18-10 10:54:12 PST)

will work on a Manual K1000 body/lens ?

11-18-2010, 01:31 PM   #2

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Yes, it will work.

But note that the effective aperture will be 3X of the aperture setting on the lens. The viewfinder will be dim and the split-prism will black out.

I can't say anything about image quality because I didn't bother to try. I immediately removed the glass and use it as an extension tube.
11-18-2010, 01:41 PM   #3
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But note that the effective aperture will be 3X of the aperture setting on the lens.
does that apply to 2x teles as well? What does that mean exactly anyways?

use this example:
50mm f1.4

if a 3x is used on a 50mm at 1.4 - that means that the 1.4 turns into 4.2 or does that mean you have to stop down to 4.2 in order to achieve a sharp photo?

same with 2x - does 1.4 turn into 2.8 or do you have to stop down to 2.8 and forget 1.4 even exists if you want to take a sharp image?
11-18-2010, 02:58 PM   #4

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In a simplistic way, a teleconverter "extends" the focal length of a lens by taking a small portion of the image produced by the lens and magnifying it to fill the film frame. The "amount of light" on the small portion is now spread out on a larger area. As a result, the image on the film frame is "darker."

So, it you combine a 2X TC and a 50mm lens at F/1.4, you have a 100mm lens at F/2.8.

Image quality will definitely suffer; how much is difficult to quantify.


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