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Michael Scherman

Lagoon and Triffid Celestron C6 Hyperstar4

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Posts Made By: Steven Choi

January 14, 2004 09:20 PM Forum: Equipment Talk

HEQ5 on Meade Tripod

Posted By Steven Choi
Hello All,

I have modified the HEQ5 to mount on a Meade tripod. With the mount head, scope and weight, it is about 60 lbs and the original tripod feel filmsy. With the Meade tripod, it is solid as a rock and yet still portable. I have not have a chance to observe with it yet because of bad weather here in Toronto.

Steven

January 21, 2004 12:25 AM Forum: Telescope Making

Re: 18" Starstructure Painting scope

Posted By Steven Choi
What is "self etching primer" and its advantage ? Is it easily available through general hardware store ?

Steven

January 22, 2004 04:18 AM Forum: Telescope Making

Re: 18" Starstructure / Paint

Posted By Steven Choi
Michael,

Good work !
What kind of paint are you using ? Is it hard and durable like powder coating ?

Steven

March 14, 2004 06:47 PM Forum: Equipment Talk

Windex on mirrors and lens

Posted By Steven Choi
Does using windex for cleaning lens and mirrors could attacks their coatings (A/R and Alumn.) ?

Thanks.
Steven

August 1, 2004 11:48 PM Forum: Telescope Making

Where is Astigmatism ?

Posted By Steven Choi
Hello All,

A Mak with three optical components (corrector, primary and secondary) that have astigmatism when viewed at the eyepiece, how do one knows which optical components that contributes to this astigmatism ? This is assuming that the diagonal, eyepiece and the observer eye is free of astigmatism.

Thanks.
Steven

November 21, 2003 10:55 PM Forum: Equipment Talk

Lousy Seeing ... Or bad collimation?

Posted By Steven Choi
Hello Darren,

I am at southern Ontario and observed the same problem except for the diamond shape. It must have been bad seeing.

January 11, 2004 09:20 PM Forum: Equipment Talk

Anyone used an HEQ5?

Posted By Steven Choi
When I receieved the mount, there is some play on both the RA and DEC axis. After adjusting the worm and gear mesh, there's no noticeable play on both axis. At high power 700X, their is very noticeable "jumpiness" at first but it was fixed after adjusting the mesh between the motor and worm shaft gear. After the adjustment, short time exposure astrophotography is not a problem. However, for long time exposure astrophotography the PE could be a problem. So in summary, this mount is good for someone that meets the following :-

a- on a tight budget for a medium duty GEM mount.
b- know how to adjust and finetune the mount.
c- not planning on long time exposure astrophotography.

I am very satisfied with this mount that I am planning to upgrade the tripod with those of Meade or Celestron adjustable field tripod. The original tripod is not a good match for what the HEQ5 mount can deliver, IMHO.

Steven

January 21, 2004 06:03 AM Forum: Telescope Making

Re: 18" Starstructure Painting scope

Posted By Steven Choi
Wow, it sounds like dangerous stuff and is not for everyone. Why is it always the pro. have all the fun !!! wink

January 29, 2004 05:32 AM Forum: Equipment Talk

IS THIS SAFE?????

Posted By Steven Choi
Why would you want to use alcohol when distilled water is fine ?

Steven

February 3, 2004 06:31 AM Forum: Equipment Talk

May Need a Part Made for Equitorial Mount

Posted By Steven Choi
Hi Lynn,

If you have a drill and saw, cut two rectangle out of aluminium stock bar (or hardwood) of the same thickness as the raised edge and drill a center 1/4" hole. Using approriate length 1/4"-20 bolts, bolt both the rectangle and dovetail saddle ( as shown by John ) together. The rectangle act like a thick washer. Hope it helps.

Steven

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