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Alexandre E Eremenko wrote:

>On Wed, 12 Jul 2006, Herbert Prinz wrote:
>
> 
>
>>Yes, but for the collimation check I also want to be able to rest it on
>>the sextant frame and be assured that the laser beam is parallel to the
>>edge on which it is resting.
>>   
>>
>
>If I understand Frank's proposal correctly,
>the laser has to be fixed behind the scope
>(so that it sends the beam to the eyepiece of the scope).
> 
>

Different experiment. Sorry for the confusion. I mentioned collimation
as an other application in the mistaken believe that Frank's method of
checking collimation had been discussed some time ago on the list. It is
this: Set the sextant down on a flat surface. Place two cylinders (like
those that Celestaire sells) on the frame and the laser level on top of
those, in a direction so that it appears parallel to the telescope axis
when being looked at from above. Project the laser beam on a distant
wall. If you can see the light spot through the telescope nicely
centered in the field of view,  the telescope is parallel to the sextant
frame.


>You think it has a straight edge strictly parallel to the beam?
> 
>

Yes, it should. If not, I find out by reverting the instrument.

Herbert

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