Hi All Just started a nights observing with my 20". I have had an Argo Navis for a while now but the weather has not been kind. WOW! Much better than the old...
Hey Andrew, Try the Argo Navis User Group on Yahoo, they may have the information you're looking for. I believe Obsession (optionally) installs both the Argo...
... ServoCat for my scope. I am in the process of installing it, but first I had to return my scope from its Dob Driver configuration to its prior condition,...
I have some questions about the things I was seeing in a star test last night. I have an 18" Obsession with a new Torus mirror. You can see the specs and...
Mirror size A 50% increase in area is about the threshold of "seeing" a difference. I could see a difference from my 10" when I built a 12", but it wasn't...
... An easy way to do that is to deliberately disturb the air around your mirror, by turning a fan on and off, while you observe an out of focus star in the ...
RULE 1: Dont touch the mirror unless its filthy, the mirror can get reasonably dusty without degrading your images too much, unless its really bad you're...
Take a look at the star testing links on this site: http://www.geocities.com/telescope1999/14-5inch.html The guy also posts some very good weather links that...
Steve: I looked into your question about turbulence and star testing. First of all, I'm no star testing expert. The following is based on what I read in...
Steve: One more thing: "Optical Shop Testing" says the following about the sensitivity of the star test in detecting spherical aberration: "In a study of...
You definately shoudn't have to go with a Secondary that Big, unless something is a bit odd with the design of the telescope. The smaller you can get the...
One subject I haven't seen banged about on this site is the idea of masking the outer edges of the primary mirror. According to some people (very in the know)...
Someone posted this link the other day, regarding how the guy constructed his focuser mounting box from formica, but he also explains on this page how he...
Sorry Neal, I cut the link then forgot to paste it in. You need to go down at least 1/2 way before he talks about testing and masking the mirror, so its...
Attilla, ... Thanks for the suggestion. I will give your idea a try. I would still be interested in any verbal descriptions you can give me of how boundary...
At a Northern California observers gathering on February 22, there was one 14" dob, three 18", one 22", one 25" and one 30". At another such gathering at a...
... At the 1997 Winter Star Party, my 20-inch homebuilt was the only 20-incher at the party that did not have some sort of DSC. Out east, I see very few 16 or...
... Ok how about this: Out of focus appearance of a star tube currents: - slow - sharp edges - swirls and rotates - seems to know your scope is round. -...
for those interested in buying or upgrading a DSC we have posted a comparison sheet at: http://rxdesignonline.com/ArgoNavis.html and click on the comparison ...
one more thing - the Argo Navis now has full Sky Commander emulation so it is compatible with both the ServoCAT Tracking and GOTO system as well as the...
Can't help but to state the apparent: this will depend greatly from mirror to mirror. If the mirror has a good edge, it won't need it, if it has edge problems...
I'm told by those who know a great deal more than I, that the outer edge is almost always the weakest point in the image. They recommend a mask for all large...
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