Re: Focusing Problem

There are aperture masks (Hartman mask variation) available for the LX200 (I
own and use one) that are very helpful.  I haven't used it in quite some
time, but I'll tell you what I remember without checking my notes:  The mask
has 3 holes, 2 of which are triangles.  The outer portion of the mask
rotates, but this is used for another function.  When you are exactly in
focus, the 2 triangles appear as one.  The mask will also tell you if you're
too far in or too far out by the orientation of the triangle image.  The
cost of this is about $20...but it could be more today.  If you do some
research, you may be able to make one yourself.

Al


"MP" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi, I'm into astrophotography, and love my 10" LX200
> HOWEVER!!!
> I can never seem to get that perfectly clear focused picture that I
expect.
> Can anybody make any suggestions?
> I am aware of knife edge focusing, and I have tried it...but I don't get
it.
> When I have the telescope out in the field, and I have a bright star
> selected, and I have my knife edge in place, what do I do? Am I supposed
to
> slew and adjust focus back and forth? Is that the technique?
>
> Malcolm Park
> Toronto Ontario.
> http://www3.sympatico.ca/malcol/b1a2r3b4.html
>
>