Re: Question: UO Ortho vs. Baader Hyperion??
Hello Mark,
there is not much left to compete on the transmission of light and on contrast with your UO 6mm ortho.
You can of course try the Baader BCO 6mm, which has about 50° AFOV, and the HT (high transmissivity) multicoatings.
For the very high magnifications I am using the BCO 6mm and the Pentax XW 7mm, Pentax+ / smc PENTAX XO smc PENTAX XW
The reason for the Pentax XW 7mm has been its high transmissivity in blue, due to the SMC multicoatings, which has been claimed(?) as being similar to the Zeiss multicoatings. In spite of it, the Pentax XW 7mm with its 8 lenses loses against the BCO 6mm on the star counts in the clusters.
The transmissivity in blue is important, as most of the galaxies are in fact blue. Moreover, when hunting the nebulae, you need the maximum transmissivity over the OIII doublet and over the blue Balmer spectral lines: H-Beta, H-Gamma, and eventually also H-Delta when you take out your 18" Dob.
At f=10mm, I take the Baader BCO and the Swarovski SW 10.2mm, - each has its own DSOs or details inside.
At longer focus, the Zeiss (Diascope) and the Leica (Televid) wide 65° - 68° eyepieces can be hardly beaten on the transmission of light and on the contrast, and my feeling is, they perform even better than the Tele Vue Plössls.
Hoping this helps,
JG
Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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