Inventor of the Herschel Wedgie. Watch your back.
Astronomy - The World's Second-Oldest Profession.
"You don't know Swift from Astrola." -C.H.-
~ JW ~
* On Active Duty: Sears 6366 (Royal Astro) / Tasco 999VR (Diamond Z) / Monolux 4380 (Cursive HOC)
* Long Time Gone: Bushnell Banner 1000 / Meade ETX-90RA (Flower Pot) / D&G 5" f/10 Refractor / Tasco (Towa) 80mm Refractor / ATM 8" f/4.5 Newtonian / Sears (Towa) 60mm Refractor
Quote:However, even with this scope there was certain class of DSO objects where 100mm ED refractor was giving better results - typically low surface brightness objects, like globular cluster NGC5033. This was probably due to sight light from all the nearby street lights.
Refractors Reflectors Two Cats A few eyepieces
Quote: "The optical quality of both the larger and smaller scopes must be similar for aperture to rule."
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Classic refractors; visual observer, old school.
"Toto, I have a feeling we're not in Kansas anymore."
Quote:Good viewing of the planets is largely dependent on image scale. The longer the focal length along with larger optics is always a good winner. That is why so many F15 systems provide such excellent views of the planets. The C14 with it's 140 inch focal length is a good example. When you get a C14 with good smooth optics and it is dialed in correctly and the seeing is good the view is pretty good. However, no matter what you say a large refractor with good optics providing those pin point stars on a velvet back ground is about as close as to driving a 911 Porsche. There is no substitute.
Keep looking up !!
"Imagination is more important than knowledge" - Einstein
Orange Tube C8, Tasco 7te-5, 4" Criterion Dynascope, Jason/Towa 313
Nikon Action Extreme & Pentax WPii Binoculars
At my club, everything one could want up to 18"
Quote:However, throw in a high end 6" APO with a focal length of about F7 you have a really good all around scope that will provide detail that will require a lot more aperture in a reflector before you will be able to see the same detail.
Quote:Sasa -- Why do you star test with a green filter?
Quote:Hello Jon, yes, I meant NGC5053, a globular close to M53. Sorry for the typo. I was chasing it for several nights with 250mm Newton but with no luck. To my surprise, I glimpsed it through ED100 just on the first try from the same location.It is not important that it is globular. I meant it as a typical member of class of objects with low surface brightness. It was just a first one that came to my mind.
Quote:Personally I don't think there is an answer to you original question. There are too many variables and qualifications. I remember a night where I had one of my best views of Jupiter thru a C14. Next in fairly dark skies, M33. Very dim view the galaxy which filled the eyepiece field even tho it was long focus. The contrast was not impressive. So I move to my 4 inch f/5 refractor and look at M33. Perfectly framed, spiral structure much more evident and contrast superb. Your question is like asking the better of apples and oranges. But I enjoy the thread. Bill