“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:That's quite intriguing.
I'm looking forward to the whole enchilada.
My longer focal length refractors certainly appear to settle down more quickly and maintain steadier images during the session than do my faster refractors. It's nice to read some ideas as to why that is the case.
Quote:Neil, I have nothing but admiration for the immense amount of time and work you have put into researching the achromat refractor. While I can build a rather nice one, I would never have been able to put into words (and with scientific justification) why they captivate people the way they do.Thank you for taking the time, and I wish you much better times ahead for 2012.
Meade 127ED Apo on Celestron CGE. WO FLT98, HEQ5, Towa 339, B&C 3" c1920.1970s Fullerscopes 4" F15, 1880s T Cooke EQ mount. Souped up Helios 6" F8 refractor.
Michael Gilmer - Member of the Meteoritical Society & Collector of Falling Stars.
☄ ⒼⒶⓁⒶⒸⓉⒾⒸ ⓈⓉⓄⓃⒺ - www.galactic-stone.com
Quote:In fact, there's a very well-known article on a vendor site claiming precisely the contrary; that focal length/ratio has no bearing on image stability.
Telescopes of equal aperture are affected the same by atmospheric turbulence, regardless of focal ratio. "
Given that this article contradicts that one
400mm f/4.46 self made Dobsonian on Tom Osypowski equatorial platform Skywatcher 130mm f/5 BlackLine (finder, widefield scope and solar continuum scope) Sumerian 250mm f/4.8 Alkaid (as travelscope without platform and on Tom O. platform above).