Re: ATM 6" mirror

[Shane_Lapierre@aici.com]

What kind of eyepiece & magnification are you using?  Do you have
astigmatism in your eyes?  Sometimes at low powers your astigmatism shows
up, especially on bright stars.

Shane LaPierre






Viper71049@aol.com on 08/09/2000 01:18:09 PM

Please respond to Viper71049@aol.com

To:   atmer@flash.net, atm@shore.net
cc:    (bcc: Shane Lapierre/CT/AICI/US)
Fax to:
Subject:  Re: ATM 6" mirror




To All who replied.

Tried adjusting EVERYTHING last night.  rotated, adjusted, collimated, It
has
to be in my mirror. I did rotate the mirror a quarter turn in one direction
and did rotatet the pitch a quarter in another. How do you (  rotate the
tilting lens with the eyepiece )? I used a ronchi for my testing and all I
saw was straight lines.  The support system uses a three point cell and is
held on with wooden supporters. I remounted the mirror last night and
nothing
seemed to work!  It might be the cool effect like Bill said because I leave
it in my HOT garage all day! So tonight I will leave it out all night and
see
what happens. I will also try to adjust the secondary.  Amazingly I think
my
system has no coma because I see a bunch of stars Its just the brighter
ones
are just stretched.  My 6" is better than full thickness it is 1.25" thick!
I got my 1.3" secondary at Orion and it said 1/10th wave so I think it is
optically flat.  Also I did test for parabola and I have a good parabolic
mirror.  But I guess more accurate results would be on a Focault tester.  I
have a Slitless type but dont know how to use it.

Thanks to all,
Tony








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