Had a blast last night with 2 x small ultra-sharp refractors: Jaegers 50mm F12 & Celestron C80P, with 2 x Tak prisms -- .965" in the J50, and 1.25" in the C80. Seeing averaged 8/10, and temps dropped faster than forecast.
The spectros PL 5mm gives 125x in the J50, and the Moon, Saturn, & Jupiter were all picture-perfect with very hard to see false color at the limbs. Got a bit of the Marble Moon Effect at 21x with that 1950s ASC 30mm Kellner. But... I barely missed Io's disappearance -- didn't get set up until 1925L -- dang it!
The C80 continues to impress. I had it stable & sharp at 284x with the AT Para 3.2mm -- 92x per inch! -- but I was tired after a busy work day, so most observing done at 227x with the TV Radian 4mm.
The fracs were side-by-side, and I rolled from one to the other on an old arm-less computer chair.
In terms of resolution & contrast, I couldn't tell much difference between them at ~ 62x per inch, using the TV Nagler 5 in the C80. The Public is gonna love the C80's views -- so much Punch! from a very light weight EQ Rig.
After The Giants, I went after globular clusters well east & north of the Moon with the J50 in negligible "glow" -- that's how clear the air was (and we have maybe another dry week shaping up).
For Tonight: Gonna put the J50 & Tak FC-50 on the same Tak Sky Cancer EQ -- see if both stay sharp at up to 100x per inch...
BB's Tiny Tak Double Stack -- I bolted the J50's rail to the 1/4-20 on the top of the FC's cradle. Looked strange, but worked well...
Up to 125x, the views were essentially identical for Saturn & Jupiter, except white zones were snow white in the Tak, and off white in the Jaegers. Both showed Titan & Dione at the same powers. Both showed 5-7 belts (2 were intermittent) on Jupiter, the GRS, & Io's shadow. But at 160x, the Jaegers lost 3 belts to the Tak's one. At 200x, I couldn't get a sharp limb with the Jaegers, and the details were fuzzy, while the Tak got dim, but stayed sharp. Seeing was 8+ with very calm air at the start. Clouds streaks moved in around 2005L from the SW; otherwise, I'd still be out there -- comparing double stars in this Double Stack.
BIF: IF you've ever owned / used a Swift 838, my J50 is every bit as good optically. I did not expect this from an old cemented objective, and in a tube assembly that I built. We used to think that Tak made the Swifts; well, based on the Views, maybe Tak made the Jaegers... (sounds like a good folk tale!)
Edited by Bomber Bob, 13 October 2021 - 09:08 PM.