Gene,

That just about matches my own conclusions when I tried to make one out
of a laser pointer. Regardless of whether it's holographic or not, such
a device includes the eyepiece adapter in the collimation measurements.
I think that even if you had a very close fitting adapter it wouldn't
work - unless you could guarantee it was exactly on-axis and orthagonal
to the optical axis (not very likely). Try your device again, get it as
closely collimated as you can, try removing and then replacing the laser
in different orientations, try altering the tension on the locking screw
- does it read the same?

Chris Heapy



Gene Horr wrote:
>
> I think this was being discussed recently, but as I am at home right
> now, I can't check my old messages.
>
> I received one of those laser pattern collimators today that has
> recently been "reviewed" and advertised in S&T. I remember someone
> asking "can it work with an SCT" and I thought someone said "no."
> But that may have been on SAA.
>
><snip....>

> With the Televue 2" adapter the laser was extremely loose. It was
> just flopping all around. While this would not be noticeable visually
> using the OTA, with the laser it was obvious. There was no way to
> get the laser centered and to keep it still.
>
> So in theory this device should work. But until someone comes up
> with a good adapter, it is effectively useless.
>
> Gene Horr

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