I believe you. And, I believe Charles. And, I believe what I see with my own eyes.
Dawned on me that my seeing reports can be related to maximum magnification per inch. That is, on what I call an 8 / 10 night, 80x / inch delivers sharp planetary views (with a quality scope). Perfect 10 / 10 nights support 100x / inch. IF we ever get some clear nights, I'm gonna see if that holds for 7 / 10 & below... It'll be less subjective than my current system: what's the faintest star I can see, how bad is the sky glow toward downtown, does the Moon have a halo / "corona", etc.
I may get to test this tonight. As of right now, skies are clear, but clouds are surging up from The Gulf...
Got my 1964 Royal 76mm F15 on the Goto 106, and my 1995 Vixen FL80S on the Mizar AR-1, and both are waiting patiently in the shed. Got all my fingers & toes crossed -- kinda makes typing & walking tough, but whatever it takes...
Clouds just chased me indoors, but not before I managed 80 precious minutes with two very fine 3" refractors. Short & Sweet Summary: Vixen = brighter views at all magnifications with 0 false color. But overall, no difference in resolution between the two at any magnification from 30x to 240x. Seeing = 8+ / 10, as I got sharp views in both at 80x per inch.
Gear: Goto .965" prism + spectros eyepieces in the Royal; Baader 1.25" prism + spectros / UO HD ORs / TV eyepieces in the Vixen.
Man! So glad I bought that used TV Radian 4mm! Cruising over the lunar surface at 160x with the FL80S -- bright, razor-sharp, with jet black shadows -- could make even a grumpy old observer happy. Can't wait to view Mars / Jupiter / Saturn at 300x (low speed!) in my APM 152ED!
The Moon: Absolutely no CA at the limb, but I did see a very slight yellowing starting at 160x in the 55 year old Royal achro, and it definitely dimmed the views at 240x. The Vixen showed whites and a zillion shades of gray. Shadows were blacker in the Vixen.
Mars: The air grew more turbulent as the Gulf front pushed in from the SW. Didn't affect the Moon, but limited both fracs to 160x. Tiny Mars was pretty in both, but a touch redder in the Royal, with one jagged gray/black line that stood out steadily, and had a "bump" in it. Oh, well...
Cirrus chased me east to Castor -- clean split in both at 40x. Ah... brilliant & colorful in the fluorite, but steadier in the Royal. Both fracs showed the same faint stars in the field.
I've made lots of improvements to the Royal -- none to the Vixen. Would a newbie with one of these ubiquitous 76mm F15s get the same results? I don't think so -- especially if they had only the bundled accessories.
The Goto 106 EQ is rare -- too bad! It carries a Royal 76 like it's a Towa 50mm. The Mizar AR-1 was sold by Orion, Kenko, and others. It's pretty darn good, but would need a taller tripod to carry a long frac. I will add an AstroMaster 9V battery drive to it -- will be great if I can include an on/off lever. Manual tracking with these mounts is smooth enough for a 3" frac's max magnification.
Edited by Bomber Bob, 12 March 2019 - 08:27 PM.