Because the beam splitter in the kalart rangefinder is
less than perfect. I was able to see light spillage
when I used my focuspot.
For those unfamiliar with the Kalart Focuspot:The
focuspot was very cool for extreme low ambient light
situations you were planning on lighting with flash.
It drew its power from the flash holder battery
supply. It plugged into one of the accessory sockets
on the front near the reflector then clipped into a
metal shoe atop the Kalart rangefinder. There was a
little teardrop door you had to slide out of the way.
The light fromn the focuspot shone down into the
rangefinder and sent two beams out onto the subject.
You focused the camera until the two beams merged into
one and you were in focus. You could do it in total
darkness. There was a lot of room for error though, it
is easier to say "focus until the beams become one"
than to do it. It worked a lot better at close range
than farther out. Maybe the lazer idea would extend
the range.
Barry Young
--- Robert Stoddard <[EMAIL PROTECTED]> wrote:
> Marv,
> As I recall the Focuspot, the light source sat on
> the top end of the
> vertically mounted RF and shone its light through a
> little transparent port
> directly along the axis of the RF. Because of the
> beam-splitter mirror,
> half of the light emerged from the top window of the
> RF, half through the
> bottom window. When the camera was focused, the two
> beams converged on the
> subject.
> If you are putting your laser light source in the
> same location, then how
> is there any danger of light coming out the
> eyepiece?
> RKS
>
>
> >From: Marv Soloff <[EMAIL PROTECTED]>
> >Reply-To: [EMAIL PROTECTED]
> >To: "[EMAIL PROTECTED]"
> <[EMAIL PROTECTED]>
> >Subject: [Cameramakers] Use of pocket Lasers with
> rangefinder cameras
> >Date: Mon, 17 Dec 2001 18:01:51 -0500
> >
> >Had an opportunity to buy a handfull of pocket
> lasers the other day.
> >These are marketed as a "laser keychain" and
> measure 2-1/2" long by
> >1/2" in diameter.
> >
> >I had remembered that Kalart made an accessory for
> the Kalart
> >rangefinder equipped Graflex press cameras that
> used a battery and
> >focused lamp to project a pair of light beams for
> focussing in low level
> >light conditions.
> >
> >When Kalart manufactured its own press camera, the
> Kalart 3 x 4, this
> >device was an integral part of the camera.
> >
> >So, the question arose - can a small laser be used
> thru the rangefinder
> >port to provide low light level focus?
> >
> >Well, I tried it and it works. The only problem is
> to fabricate a fail
> >safe blocking plate that prevents looking thru the
> rangefinder when the
> >laser is in operation. Perhaps a slide switch
> arrangement?
> >
> >The cost of the keychain lasers - at the
> Englishtown (NJ) flea market
> >$2.00 each including 3 LR44 batteries.
> >
> >Regards,
> >
> >Marv
> >_______________________________________________
> >Cameramakers mailing list
> >[EMAIL PROTECTED]
> >http://rmp.opusis.com/mailman/listinfo/cameramakers
>
>
>
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