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Ted,
The title of the April talk I'm giving will be "Everything you always
wanted to know about Copernicus(but were afraid to ask)" if you want
to update the web page.
I have been on call continuously for several weeks and have not been
able to get the scope out for fear I would be called in and have to
put it all away fast.The few times I have had it out the stars don't
seem as crisp as I would expect. It's either 1 poor seeing 2 poor
colimation 3 something about the scope. I suspect a severe
collimation problem. Need to find a nightwatch where I can see what
you guys think.Any suggestions for SCT collimation would be welcome.
Joe Piotrowski

Thanks Joe. I'll update it.

With the SCT ... it could be a combination of both poor seeing and collimation. While SCT's hold collimation well they are also very sensitive to good alignment.

Wait until you have a good night, stars (Sirius is a good indicator) should not be twinkling. Pick a moderatly bright (2nd, 3rd magnitude) star at a comfortable angle. Make sure the star is centered in the FOV and defocus slightly. The secondary shadow should be centered in the smeared star image. If you see that the image is boiling when defocused, its not the best night to try this. If you determine that you are out of collimation, I suggest you wait until you have someone to help you. Its difficult to accomplish alone using a star.

At this point, I'm hoping Bruce Bodner will chime in and explain how he had great success with an artificial star and daytime alignment (so much easier).

Ted




In a message dated 3/9/2003 8:22:59 PM Eastern Standard Time, "joseph_piotrowski" <joepiotrowski@...> writes:

Ted,
The title of the April talk I'm giving will be "Everything you always
wanted to know about Copernicus(but were afraid to ask)" if you want
to update the web page.

It's either 1 poor seeing 2 poor

colimation 3 something about the scope. I suspect a severe
collimation problem. Need to find a nightwatch where I can see what
you guys think.Any suggestions for SCT collimation would be welcome.
Joe Piotrowski

Joe,

Probably one of the best websites that explains collimation is Therry Legault's site:



You can do a google search and find many more.

It's a bit intimidating at first, but it's relatively easy.

One thing you definitely want is a set of Bob's Nobs, or the equivalent from scopestuff:



These are nylon thumbscrews that replace the factory screws. My Meade requires a hex wrench to adjust them; the Celestrons may require a screwdriver. Nothing's worse than hearing the "tink" when you drop a hex wrench on your corrector!!!!

Rob






From: "joseph_piotrowski" <joepiotrowski@...>
Reply-To: backbayastro@...
To: backbayastro@...
Subject: [backbayastro] April talk
Date: Mon, 10 Mar 2003 01:22:59 -0000

Ted,
The title of the April talk I'm giving will be "Everything you always
wanted to know about Copernicus(but were afraid to ask)" if you want
to update the web page.
I have been on call continuously for several weeks and have not been
able to get the scope out for fear I would be called in and have to
put it all away fast.The few times I have had it out the stars don't
seem as crisp as I would expect. It's either 1 poor seeing 2 poor
colimation 3 something about the scope. I suspect a severe
collimation problem. Need to find a nightwatch where I can see what
you guys think.Any suggestions for SCT collimation would be welcome.
Joe Piotrowski


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In a message dated 3/10/2003 9:44:01 AM Eastern Standard Time, "Rob Schonk" <robschonk@...> writes:

???Nothing's worse than hearing the "tink" when you drop a hex

wrench on your corrector!!!!

No? What about the "clunk" of your secondary impacting the primary?

Or the sizzle as your scope begins to burn?.....bring back memories,
Ted?.... :-}

Denice

He does it all with smoke and mirrors....



From: "Woody, Denice K" <denice.k.woody@...>
Reply-To: backbayastro@...
To: "'backbayastro@...'" <backbayastro@...>
Subject: RE: [backbayastro] April talk
Date: Mon, 10 Mar 2003 08:22:26 -0800

Or the sizzle as your scope begins to burn?.....bring back memories,
Ted?.... :-}

Denice