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Kalart calibration troubles.

 
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hamradio



Joined: 01 Jan 2014
Posts: 6
Location: duluth, minn.

PostPosted: Wed Mar 12, 2014 4:27 pm    Post subject: Kalart calibration troubles. Reply with quote

I'm trying to calibrate my later sidemount Kalart to a Raptar 135. Should be an easy task.

However, this is proving to be a nightmare. I've messed around for four or five hours, doing the procedure in the Kalart manual. I can never get it to be spot on; I'll get everything calibrated to 15', then start on the short scale, upsetting infinity and the long scale once again. Making tiny adjustments, I'll get everything to what seems good, but I can never get it to be accurate closer than 6' or so. One thing that seems weird; my long scale is set to around 6 and short scale around 7, I think––this seems backwards, as the recommended starting points in the manual are 15 and 3.5, respectively.

Is this problem due to the rangefinder arm not being clocked properly, or something to that effect?

Additionally, is the RF only to be used when aimed at objects at the same height as the RF, in a given situation? I find when calibrating, if I aim at a subject higher or lower than the rangefinder by a few feet, focus is a bit off, even at longer ranges.

Thanks.
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45PSS



Joined: 28 Sep 2001
Posts: 3207
Location: Mid Peninsula, Ca.

PostPosted: Wed Mar 12, 2014 5:32 pm    Post subject: Reply with quote

6' is about correct for the close focus distance of a 135mm lens with any rangefinder.

For accurate calibration the target must be at the same level as the camera as shown on page 8 of the manual, http://www.cameraeccentric.com/html/info/kalart_1.html .

I have never found the numbers listed as starting points to be the final correct setting for any given lens.

You may have to fully disassemble the rangefinder, clean all parts in a residue free degreasaer, lube lightly and reassemble to get it to adjust correctly.
http://lommen9.home.xs4all.nl/kalart/ may be of some help.
Or you could send it to me for repair.
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