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VdB 141 Ghost Nebula

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Posts Made By: James McSheehy

February 2, 2010 02:02 AM Forum: Reflectors

Re: Maksutov Telescopes

Posted By James McSheehy
A MCT could be based on an f/1.2 primary, but man oh man is that corrector going to be an expensive chore. 8O

February 9, 2010 12:54 PM Forum: CCD Imaging and Processing/Solar System

My best Mars, 9 Feb. A.M. U.T., Afocal, Canon SX-1

Posted By James McSheehy
Very nice detail Jason! What scope did you use and how was the seeing?

February 12, 2010 04:06 PM Forum: Religion

Spirituality due to brain damage?

Posted By James McSheehy
There are numerous examples of great scientists who also held spiritual beliefs. Maxwell and Schrödinger both found the balance in their lives and no one can deny their discoveries changed the world for the better. So I find it odd that many scientists and "progressives" find it necessary to be openly hostile to others who dare to express spiritual beliefs. What is it they hope to achieve with this hostility?

February 17, 2010 11:01 PM Forum: Telescope Making

metallic foam- any ATM uses?

Posted By James McSheehy
Open and closed cell aluminum foams are already used in many special applications. I've always thought a baffle tube made from open-celled aluminum foam would be a good way to suppress tube currents in CATs.

http://www.metalfoam.net/commercial.html

February 18, 2010 05:23 PM Forum: Refractors

So many Astro-Physics Refractors for sale..

Posted By James McSheehy
In case you haven't noticed, the U.S economy is teetering on depression. Cash is king, and nice as they are apo refractors can't pay debts -- until they are sold and converted to cash. 8)

February 18, 2010 05:30 PM Forum: Reflectors

Starizon Hyperion 12.5" astrograph

Posted By James McSheehy
I considered this scope and even put my name on the list over a year ago. After many months with no news about a ship date, I bought a 14" Meade ACF OTA at about half the price.

March 4, 2010 07:54 PM Forum: Equipment Talk

Re: 2 inch ap diagonal vs tv diagonal

Posted By James McSheehy
That's been my experience with protected silver. I have a Russian-made diagonal from the late '90s, silver on a sital substrate, and it shows no signs of tarnish or pinholes. To be fair I've never lived near the ocean or a steel mill, so others may have a different take on silver's longevity. 8)

March 17, 2010 03:52 PM Forum: Digital SLR AstroPhotography

Lumix Mirrorless DSLC

Posted By James McSheehy
Jay, let us know how it works at prime focus. I'm thinking of getting a camera like this to use as a planetary imager. Many of the latest models will shoot video at 30 or 60 FPS and when you compare the features in these compact cameras to what you get with one of the souped-up webcams, they are really a bargain. Live view, local data storage, HD resolution, plus you can use them to take regular photos.

March 20, 2010 02:59 PM Forum: Telescope Making

Oiling a doublet with failing cement?

Posted By James McSheehy
If it is really old, it's probably cemented with Canada Balsam. You could try flowing some in at the edge. Newer lenses are bonded with the UV-cured adhesives.

March 25, 2010 05:04 AM Forum: Digital SLR AstroPhotography

Digitized images from old magazines

Posted By James McSheehy
"M109 galaxy" in Google images returns over 17,000 results.

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