“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
Quote:I wander around CN because of my various scopes, but I consider this forum as home, followed by EPs.
Scott my scopes: a few refractors (50-102mm), 2 Newts (4.5-12"), and an 8" SCT
Quote:Quote: No one sends a Newtonian to the factory to be collimated, it happens with refractors all the time...Jon Yes, but you can easily collimate a Dob. Collimating a refractor...good luck with that; maybe if you start now, you'll be ready by tonight....
Quote: No one sends a Newtonian to the factory to be collimated, it happens with refractors all the time...Jon
Quote:"Newtonians have very lax collimation tolerances because there is only one curved surface so they can be collimated by the owner in the field in a moment are two."Only if you're looking at blobs (DSOs). Even slight decollimation of a Newt kills it for planetary work. Moreso the faster the Newt.Slow doublet refractors, on the other hand suffer the least from miscollimation errors. So long as both elements are in the same backyard, that's good enough for planetary viewing. - Jim
Quote:It's really weird there. They talk about seeing Stephan's Quintet and the Horsehead Nebula. Like anybody can really see that stuff.
Quote:I stumbled in there a couple of times. I whistled and snuck out real fast.
Quote:By mistake? NO.. but I have gone there to escape the numerous "whats the best refractor for under $XX.." threads that keep coming up.Rex
My eyepieces are made from the waste product of exploding stars.
10XTi 102XLT ST80A(2" Focuser); President, Eypieces Anonymous, Denver Chapter (Hello, I'm an eyepiece junky, what's your excuse?)
DAS Dark Site
Quote:Quote:"F15 refractors need quite a mount, and can be like using an long reflector with ladders and or contortions."Not so much, really. A 4" f/15 works just fine on a CG5-GT with the 16" Orion pier extension. A smaller f/15 or slower works well on pretty much any mount.4" f/15 on a CG5 with pier:
Quote:"F15 refractors need quite a mount, and can be like using an long reflector with ladders and or contortions."
Quote:I just went to the Reflector forum thinking I was in the Refractor forum and I'm thinking, "Man, there are a lot of new post I didnt see an hour ago." And then I started reading a new post and after a few lines I was thinking, "What am I reading?" Looked up and saw I had accidentally gone into the Reflector Forum. Thought that was funny and just wonder if anyone else had done that and how long did it take to realize. I'm in the wrong place.
Show me an aging Greek and I'll show you the Nick of time.
Friends call me Duane. Compustar C14, Leo Henzl's Custom C8, 6" Refractor Adv. GT mount, 6" F5 Omni XLT Newt., LXD-75 F4 Imaging SN8, Meade 8" F6 Newtonian, EX Dynamax DX6, RV-6 ETX-90 Astro, Meade 2045 4" SCT, B&L 4000 Vixen/Celestron 80mm F11 JC Penny 60mm AZ/ALT Refractor Binos 25x100
Quote:Just remember, they come over here looking for finderscopes.......
Rob Tak EM200, TEC 140
And if the dam breaks open many years too soon, And if there is no room upon the hill And if your head explodes with dark forebodings too, I'll see you on the dark side of the moon.
Quote: Zowie!!! You need a cherry picker to observe with that. I bet that pulls in some detail.
Quote:You know, it is possible the big dob is the finder for the little one...........might have a wider FOV.....
Quote:True, but IMHO it belongs on its own mount. It looks to me like using it in its current position to find things for the main scope would be an ergonomic nightmare. A finder would be better off near the eyepiece IMHO. Also, the finder there probably has a focal length of a whopping 1500 meters. That would limit its use as a finder. Why not a 4.25" or 6" Starblast tube near the eyepiece....
Quote:I can't believe that I miswrote the finder focal length as 1500 meters! Zounds! I meant 1500 millimeters! I corrected my post in that respect.Well, Jon, you make some good points, as usual. I still believe a 4-6" short tube reflector would make a better finder with a capacity to get a 3-4 degree field of view with a reasonable eyepiece. A magnifying finder in the back would best be a reflector for comfort.
Quote:Quote:You know, it is possible the big dob is the finder for the little one...........might have a wider FOV..... Of course it would. It's got a bigger opening to allow in more field of view.
Jeff -----TEC 140, Stellarvue SVR90T, SV115T20 and AT65EDQ refractors,Webster D14, C11 EdgeHD Lunt LS60THa solar scope double stacked with LS60FHaTelevue Pan 41; Ethos 21, 17; Nagler 31T5, 9T6, 7T6, 5T6, 3.5T6; Delos 10, 12, ES25, 14, 9Astro-Physics 900GTO with Rob Miller Tri36M TripodDM-4 Mount-Extension-Tripod w/ Sky CommanderDM-6 Mount-Losmandy Adapter/Extension-Berlebach Planet w/ Argo Navis
Quote:I camped next to a 40 inch home made dob this summer at the Oregon star party. The guy made the mirror out of fused plate glass. It weighed about 800 pounds and he needed a wench to load or unload it from the trailer. Fun to look through but we ended up mostly on very faint objects that were still on the edge of perception. He was looking for a permanent dark site to keep it at. It was a little too much hassle to transport. The ladder was a 16 foot Tallman astronomy ladder modified to have wheels to easy positioning.