"I like to watch"
TS 130/912 (f 7.10) Triplet Apo Refractor TS 152/1200 (f 7.90) Achromatic Refractor Astrologers say the future is written in the stars but Astronomers know this more so applies to the past... http://www.flickr.com/photos/72473941@N03/
Quote: Fact Four: I am not a doctor or lawyer, and it would be fair to say the same for many of us. In fact, I would say many of us have to watch our budgets in these times. Taking out a second mortgage to buy a scope does not make sense if you are on a budget, and maybe you do not want to save in the piggy bank for 5 years to get a scope. Then for average working folks like us that want a refractor (before we die) an achro fits the bill. And it will show us AT LEAST 90% of what an apo of the same aperture will show with decent quality optics on both sides.
“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:You have to ask yourself: What kind of astronomer am I? One who studies the heavens, or one that spends much precious time studying optical quality.
Orion Sirius mount
Quote:Well, I'd be very surprised if (e.g.) one could see (meaning "visually") the $1300+ difference between an ES 127 Achro and Apo if you had them side by side looking at (e.g) The Orion Nebula. No doubt the Apo would have drastically reduced CA if viewing the moon. How about the $???? differencween ES's 152 mm Achro an
Nine telescopes of a diverse nature. My Web Site Cosmic Cat: a children's book about astronomy for iPad. English Lessons for Amateur Astronomers
Quote:Proof once again that apos have little more than fashion appeal to recommend them.
Scott my scopes: a few refractors (50-102mm), 2 Newts (4.5-12"), and an 8" SCT
Quote:This somewhat answers my previous question about refractors make in the UK, but there are more questions.
From reading the Skylight description, it looks very nice, but why are the lenses imported? Why is no one making objective lenses in the UK?
Last month I viewed thru a 6" f/15 refractor made by an amateur from North Carolina. Very nice views. It seems that all the American "boutique" refractors originated from an enthusiastic amateur telescope maker.
Quote:"Ultimately, to me the quality of the optics are key...and if it happens to be a long achromat tube, then so be it."
Richard, I couldn't agree more. At a given aperture, assuming rational design and choice of glasses, the refractor with the better optics will be the one that shows you more, fast or slow, apochromat or achromat. You can't go wrong with quality.
Quote:Lynnblac's post seems to be THE ONLY accurate assement of why apos have become the new fashion statement. Long focus achro performance in a shorter tube. I also seem to recall that Thomas Back, who seems to be revered here among the apo crowd, stated in one of his essays awhile back that the main reason for apos is to attain a well color corrected image found in traditional long focus achros while keeping the tube length manageable. It would seem that this is the ONLY valid reason for such instruments to be made.....
ATM Nut.6" F15 Jaegers Refractor on Homebuilt EQ mount12.5" Homebuilt NewtProjects:16" F7.2 Reflector
"your signature is too long. Please use the back button to edit your signature" A scourge of equipment unpopular to most, but fun for me!
Quote:I've arrived a bit late to this party but let me add this observation: You can go to a star party and have a look through an Achromat. Not so with the APO's, they always have some monstrosity of cameras, filters and other doo-dads attached. How is a guy supposed to do a comparo if the APO guys are always when hunched over their laptops, blocking up the focuser tube with that electro-junk? I think they do that on purpose, they are afraid of the truth.
CPC 9.25 TV 76, 102, NP 101 Unitron 114 Gibraltar mount Half Hitch Mk III SolarMax 90 .7A/B15 Coronado PST Eyepieces from the sublime to the ridiculous
Quote:Actually, there's a silver lining here, Joe.The next time I'm showing the guy next to me who has a 6" f/8 achromat, Sirius B in my TEC, I can console him."Aww, don't take it so hard! My scope has all kinds of Seidel aberrations that yours doesn't. And your scope has a design that was responsible (shortly after the dark ages) for all kinds of discoveries. Not one single major scientific discovery has been made with a TEC. Want to have another look at Sirius B?"
Quote:Actually, there's a silver lining here, Joe.The next time I'm showing the guy next to me who has a 6" f/8 achromat, Sirius B in my TEC, I can console him."Aww, don't take it so hard! My scope has all kinds of Seidel aberrations that yours doesn't. And your scope has a design that was responsible (shortly after the dark ages) for all kinds of discoveries. Not one single major scientific discovery has been made with a TEC. Want to have another look at Sirius B?"- Jim
Astronomer for the People. "Taking Chaos out of the Cosmos" "There's an amazing universe all around us...EXPLORE IT!!!" So many galaxies, so little 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
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:Here at the Goddard, KY star party I'm the only person there. Guess my scope is the best on the field.