... the RARE Vixen FL90S comes to mind.
FC vs FC
I put the FC-100 on the tall pedestal Meade StarFinder EQ, but left the FC-50 on the VersaGo 2... Why? Cause the CV-19 shot has added to my senior senility, that's why! (The Tak SC / Filo was unoccupied, but under a tarp. Outta sight, outta BB's mind, I guess.)
Seeing was much better tonight from 1930L to about 2130L (0030-0230Z) -- most noticeable while the Moon was slightly E & W of the meridian. But... surface winds were SE at 8-12 knots. Didn't effect either of these relatively massive Taks. (Kinda cool to say, my TAKs - plural.)
Both Taks used Tak prisms. Started on the Moon at 20x each. Zero fringing, zero blue, red, green, or yellow seen on the Super Bright disks. Ditto as I stepped up to 30x per inch, and 50x per inch.
Star Color Comparisons
Besides Regulus & Arcturus, there's a RED star between Gemini & Cancer that I really like, so I actually started there after the luna-see. I saw no color differences at 40x & 80x. FC-100 Arcturus is like FC-50 Arcturus, which is like what I see myself. So if there's scope error, it 100% mimics BB error -- can't imagine Tak letting that happen.
Magnification & Resolution Comparisons
40x / inch & 80x / inch...
It's easy to get both FCs to 80x; tough! to get the 50 to 160x -- had to use the .965" ASTRO 2x Barlow. It's a circa 1964 accessory in mint condition, so that may have affected the 50. But, it didn't look like it. For consistency, I did swap the spectros .965" PL5 between the two. To get the 100 to 80x / inch, I used my brand spanking new (delivered yesterday!) Tak 2x Barlow.
Obviously, the 100 showed more fine details than the 50 at both settings. What I wanted to see was whether one or both got "soft" at the near-extreme magnifications. Nope. My primary target was the "shield" around the crater Copernicus. What's surprising is just how much the Tiny Tak can show in 8 or better seeing.
After this, I ignored the 50 for a bit to count Plato craterlets (4), explore the Alpine Valley, and the area around the Rupes Recta (Straight Wall). Some of the tiny features that were difficult last night were much easier tonight. (Duh, huh!) Like... the 2 micro-craters on either side of the crater end of Rima Birt.
Edited by Bomber Bob, 20 May 2021 - 10:48 PM.