“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:Now if you have a TAK or TEC that you want to swap to get my Vixen I'd be glad to help you out.
Quote: Refractors are illogical any way you slice it.
"You're not afraid of the dark, are you?" - Riddick "The best scientists are humble. They seek to understand, not to ensure their legacy, but merely to understand." - Mori
Quote:There seems to be a resurgence in interest in the achromatic scopes.
. . . That being related, I'm wanting another achromat, with said Antares f/15 appearing more and more desirable, especially with its Japanese doublet, if I'm not mistaken, and costing less than that of the Skylight produced in London.
Quote: Just as the achromat replaced Galileans and Keplerians,
Quote: Know where a guy can buy a quality Keplerian these days?
Quote: the apochromat has rendered the achromat largely irrelevant (in a commercial sense)
Quote:Technological advancement is absolute and does not grant exceptions. Just as the achromat replaced Galileans and Keplerians, the aprochromat has just as surely and irreversibly replaced the achromat. Jim, At a guess ?? more achromats have been produced in the last 20 years, than the preceeding 300 ! So how they have been replaced with apos is an interesting assumption.I know everyone is looking for the latest big thing !Just like diffractive optics were going to make all other lens types obsolete 40 years ago , now we have this development. Suggest we don't hold our breath !! Ian.
Clear Skies & Have Fun! Abb Celestron Omni XLT 120 Refractor w CG4 tripod/mount + 16" Orion Pier Extension, 8-24mm Zoom, 2" EP Kit, 15x70 binos: 8" Skywatcher Dob & Telrad: Meade 8-24mm Zoom: Baader 24mm 68° EP: Kendrick Solar Filter: Coronado PST: Explore Scientific AR102 Refractor, 4.7mm, 11mm & 18mm 82° EPs: Orion ST80-A The Bible tells us God created the Universe; Science tells us how He did it; And through my telescope I marvel at His handiwork ~ Unknown
Quote: Quote: Refractors are illogical any way you slice it. I don't think so. They do have their niches, which they serve well. One thing they do better than anything else in my experience, is wide-field deep-sky observing. They also cool down quickly and so if you have only a limited amount of time for lunar-planetary observing, a refractor is the way to go. They are also superior for solar observing. Double star observing is also one of their traditional niches. Clear skies!Thomas, Denmark
Quote:Hi John,I, too, enjoy observing binaries and will take your advice in regard to the Skylight over the Antares. Thanks.Incidentally, how often does the weather allow for clear nights there in the Northwest? Cheers,Alan
-Tristan Schwartz- Former Resident Astro-Guru, Arizona Museum of Natural History
Member of Colorado Springs Astronomical Society Look for my article "Making the Case for Structured Observing," coming to Sky & Telescope in 2014!
6" Orion DSE Dob, Coronado PST
Quote:Interesting and enlightening read....
I am sure the achromats will stay around as cheap alternatives for a long time to come, in my view they never left the amateur scene!
Quote:Well Barry's backlog at D&G has gone from 1 to 2 years so I guess that says something about achro-popularity.Funny, thinking about it, over the last 50 years I've been in the hobby, I've never been without a 3 inch or larger achromat.Jeff
Quote:Are achromats enjoying a come back?
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html