... Hello, I use my homebuilt 16 inch f/5 . It is computer controlled using Mel stepper system. Mel DOS software scope.exe (DOS is real time) has very useful...
I have added to the "Dob Imaging" folder under Photos some very nice shots taken by Jerry Pinter. These were SINGLE 15 second exposures using an 18" dob, Canon...
Given the 15 second exposure, those are some pretty incredible pictures. Anyone know what the QE and readout noise ratings of the Canon EOS 20dA are? Thanks. ...
Hi, Has anyone heard of anyone computerizing an Orion dobsonian telescope? Specifically the XT12 Intelliscope. Thanks, Andreas Sheriff Oracle 9i Certified...
... You might also try the skyquest-telescopes yahoo group which is specifically for this type of scope.(Orion dob) I do not understand what you are asking....
Lowell, This was Jerry's posting to another group on these images: Hi all, I just joined the group. I built an 18" Obession "clone" from scratch using Dave...
re/bob bunge. I depends on your age and balance in the dark . I'm 54 and just finishing an 18"f5.7. I dont like the images below f5-too mushy and light...
... The lighter background isn't inherent to low f/. It's a byproduct of the fact that a given EP in a scope of given aperture will give a lower magnification...
I know what you mean. My 14.5" f/7 is 8 ft. up to the eyepiece and weighs 145 pounds, but the views are well worth the size. It is a real planet and globular...
Tallman tripod ladders are almost a must have: http://www.tallmanladders.com/astronomer.html Wider at the base, more stable and on soft dirt/grass, they stink...
My scope is a 25" F5 and the eyepiece is quite high. Since objects at zenith are rare, and the scope is hard to track in that location, I try to stay below...
Well I may be picky, but I hope my dob owning friends don't buy ladders that "stink into the ground"! (see below) But maybe that's better than stinking into...
A friend of mine just bought a 25" Obsession. He ordered a trailer for it. Got the correct suspension, all the right features, and a custom height to fit into...
I think that he should get what he ordered. If he doesn't care, then he should keep it. I'm not so sure that the temps inside are much different..... they...
"We don't need no {ladders}. I don't have to show you any stinking {ladders}." With apologies to Alfonso Bedoya, "Gold Hat" in "The Treasure of the Sierra...
... I keep my 25" obsession in a white trailer. The inside stays quite cool even at the Texas Star Party. But it wasn't always that way. When I first got the...
Atilla, Wow, thanks for the info. I actually tow my little 5x8 around with me to live in. The scope goes in the truck. I've set the trailer up with a bed and...
Hi All, Re: "I dont like the images below f5-too mushy and light background." As Bob Bunge has pointed out, the f/ stop has no effect on the brightness of the...
Hello What brand and size trailers did you order? I am considering a Pace American Cargo Sport 8'x5' trailer to haul my 20" scope and serve as a base camp. Any...
Old, but very interesting article in one of the original ATM books by Horace Dall where he did temp. readings in test structures painted various colors. It's...
... A good trick to get paint to stick to aluminum is to wash the surface with vinager and let dry. It will micro etch the aluminum so the paint can adhere far...
I find it very hard to believe the inside temps would be the same... how was this measured or was it just the "word" of the salesmen? I think Peter needs to...
Attila, a very interesting post! Not to say "cool"... Googling got me an interesting paper: "optical properties and radiative cooling power of white paints"...
Indeed. I was beginning to think I was the only person who wondered why shiny metal objects get so hot in the sun, when they should be reflecting, not ...
Googling some more, I found: http://www.measurement.sk/2004/S3/Bartl.pdf showing some interesting curves. Pure uncoated aluminium, it seems, will absorb some...
Gary, this was based on Peter's personal experimentation. He went into "his" black trailer and a similar white one nearby. Both had been out in the sun. His...
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