Astronomer and Golfer - C11 and Vixen 140mm NA140SSF Refractor - G11 mount on permanent pier (in my moderately light polluted back yard) - Older Meade 8" SCT for travel
"The heavens declare the glory of God; the skies proclaim the work of his hands." Psalms 19:1
I ache, therefore I am
Used acronyms: NEML=Naked Eye Magnitude Limit, SQM=Sky Quality Meter, TML=Telescope Magnitude Limit, CO=Central Obstruction, delta_m=difference in magnitudes between double star components, RoT=Rule of Thumb, pD_mm=proposed D_mm for resolving a binary (ident with earlier used pA=proposed Aperture), D_mm=Diameter (of scope) in mm, UCAC4=USNO CCD Astrograph Catalog 4th edition
Quote:Do not give up on your C11 until you spend the time to really nail the collimation. Took me two night to really get it right, but it was worth it.
Quote:I use a C11 for imaging and measuring. The trick is precise collimation. I also use a Royce DK. The trick is precise collimation. Do not give up on your C11 until you spend the time to really nail the collimation. Took me two night to really get it right, but it was worth it.Ed
Quote:I have a Lymax cooler but its effectiveness is mostly TBD at this point. My C11 tube is black and I have wondered if covering it with a towel or something might help lower the temperature gradients (would mostly avoid the tube radiating heat to the sky). Just speculation.
I wander’d off by myself,
In the mystical moist night-air, and from time to time,
Look’d up in perfect silence at the stars. -Walt Whitman
ES f/7 102mm ED triplet APO CF
iOptron f/12 150mm MCT
Meade f/10 203mm SCT OTA, f/6.3 reducer
Celestron AVX mount
Orion f/12.1 127mm MCT / Celestron SE mount
Astro-Tech f/6.5 AT65EDQ Astrograph
Orion SSAG/mini guide scope
Orion SSAIO camera
Canon T3i DSLR
Baader Hyperion III 8-24mm zoom
ES82 4.7mm, 18mm
Time spent looking at the stars is added to your life
Bashful, Misty, and little Ralphie - my heavenly stars
A-P 105 Traveler ~ TEC 140 ED ~ TEC 6 MCT
A-P Mach1 GTO ~ Losmandy GM-8 ~ TV Gibraltar
Meade 305 ƒ/10.4 LX200 • Royce 250 ƒ/19 Dall Kirkham • AstroTech 250 ƒ/8 RC • AstroTech 250 ƒ/4 "RFT" Newtonian • Meade 80 ƒ/6 ED APO • TEC 140 ƒ/7 APO • Orion 180 ƒ/15 Mak Cass ... Denkmeier II binoviewer - Nikon 8x60 binocular
Astronomical Files from Black Oak Observatory
Quote:personally, i prefer the esthetic simplicty of a refractor double star image, and royce's claim that his DKs yield "refractor like images" is nonsense. there's also no qualitative benefit to more light grasp or resolution, since you're just going to see the same configurations at greater astronomical distances, with more trouble about aperture seeing.
Quote:Indeed. And I'm fairly certain most modern 6" refractors would put Burnham's to shame. (Though, who wouldn't want to add it to their collection?)Clear skies...
Quote:FWIW I have just bought (used) a Vixen 140mm NA140SS 'Neo achromat'. See this thread, http://tinyurl.com/ll6fhmu , in this forum for more information.This is kind of a poor man's Televue in a way. It has an f11'ish (don't know for sure) achromatic objective and a focal reducer in the rear (built in) that brings the optical train down to f5.7. From a visual optical performance perspective it has many of the characteristics of a longer fl achromat but in a smaller package. I honest did not chose this scope because I felt it was the best choice for me. I have become convinced that 'the best choice' for me is right now indeterminate. I wouldn't know it if I saw it (or in the case of a 175mm AP Starfire couldn't afford it). And this (used) scope was a very good price and I think that I can recover my investment if/when I decide to experiment. Scope is (literally) in the mail.dave