[rollei_list] Re: Kalart Focuspot for Rollei

From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
To: rollei_list@xxxxxxxxxxxxx
Date: Tue, 10 Jun 2008 00:16:19 -0700 (GMT-07:00)

-----Original Message-----
>From: Choiliefan@xxxxxxx
>Sent: Jun 9, 2008 8:51 PM
>To: rollei_list@xxxxxxxxxxxxx
>Subject: [rollei_list] Re: unsuscribe and the Kalart Focuspot for Rollei
>
>Richard,
>Been wondering if a laser pointer could be aimed through that top port on  
>the Graphic's Kalart rangefinder and work the same way as the bulb  attachmet?
>My Anniversary Speed Graphic needs new mirrors and calibration otherwise  I'd 
>try it.
>Off topic but a refreshing.
>"Unsuscribe"?  Who proof reads and edits this stuff?
>(^:
>Health, Peace
>Lance
>Selma, NC 27576
>~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
     A laser pointer should work fine. The Focuspot has a bulb from a pencil 
flash with a lens in the tip. A laser does not need the lens. 
     The mirror can be replaced but I don't know if the material is still 
available. I got mine from Edmund Scientific but they are now splt into two 
companies. There are instructions on the Graflex.org site with the Edmund part 
number but these are not such good instructions. They say to break out the old 
mirror. Its not necessary. The mirror is held in place with a waxy glue which 
can be removed with a solvent like Acetone. I don't know for certain what the 
original cement was but even airplane glue will work for remounting. The half 
silvered mirror material is cut with a carbide scribe. Its hard to tell the 
coated side from the plain glass side but it can be done. The  reflection from 
the uncoated side will be weaker than the front reflection when the coating is 
in front because the light must pass through the coating twice. The coated side 
should face the eyepiece. 
     For some reason weak mirrors are common on certain Kalarts and not others. 
     The oldest ones also have a mirror at the bottom rather than a prism. I 
have not heard of problems with these. 
     The Kalart has two undocumented adjustments. One is a stop screw for the 
armature that carries the moving prism, located at the back near the base of 
the eyepiece. The other is an infinity setting on the prism. Both were factory 
settings but can be gotten back with a little fussing. If the infinity setting 
for the prism is not correct the adjustments for distance never come in quite 
right. 
      Once you have the prism and the bed infinity stops right the distance 
adjustments will come in over the entire range from infinity to four feet. 
Actually, if working right, the thing should track down to its close focus 
stop. 
      There is also a problem with parallax for close distances. One needs a 
double focus target, one cross hatch in line with the taking lens and another 
for the rangefinder top lens. Kalart states in their patent that the thing was 
never meant for close focusing but, nonetheless, it works pretty well there. 


--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
Los Angeles, CA, USA
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[rollei_list] Re: Kalart Focuspot for Rollei

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