Quote:what would you need to use the Baader T2 with the 37mm Zeiss prism for visual? Are there 2 " components available?
Rodger EON 80 Tak TSA-102 EON 120 Orion Apex 127mm Meade AR6 Tak FS-152 Celestron Nexstar 6SE and 8SE Celestron 9.25" SCT Meade 10" LX50 Celestron 11" SCT Celestron 14" SCT 16" Teeter/Zambuto 20" f/5 Obsession Classic Zeiss Conquest HD 10X42 Astro Physics Premium 15X70 Oberwork 20X80 Deluxe III Oberwork BT 100-45 Complete set of Baader Genuine Orthos Zeiss Diascope eyepiece 12mm, 68AFOV, Great eye relief (sharpest, highest contrast eyepiece I own, just awesome) etc., etc.
Matt in Oz
Takahashi Mewlon 210 F11.5 = 2415mm
Takahashi TSA120 F7.5 (out on loan) = 900mm
Takahashi FC76CSV F7.5 = 570m
Takahashi FS60CB F5.9 = 355mm
Quote:I'm afraid I have to disagree. Scatter manifests itself as a glow around the Airy disk. Increased transmission would not go outside of the Airy disk, but would instead would make the Airy disk brighter.
Plus because of what BillP is doing, I took my 1 1/4 dielectric diagonal out of my TSA-102 and replaced with the Tak prism diagonal and saw more detail on Jupiter's disk. It was quite astounding.
Quote:A monochromatic light source might be more scientific, however, the results would only apply to that particular wavelength. In real life, we have polychromatic light (unless a narrow band filter is used) and thus the observed scatter with a polychromatic light source may more closely resemble the real life experience. Thank you BillP for taking the time to do this extensive comparison.
The opinions expressed herein are solely mine as an amateur astronomer hobbyist & consumer. Information herein was correlated from experience, discussions with others, & research from multiple sources freely available at time of posting. All reasonable care & skill was used, but no warranty is made as to accuracy, & liability cannot be accepted for errors/omissions. This is for information only and not intended nor implied to be a substitute for professional advice.
Quote: That's after I brave the cold tonight to try to see the supernova
Quote:That looks suspiciously like the T2 Baader prism in the Telescope Service ad which has a too small for 2 inch 37 mm prism. It also seems to be a little low on the price side for the the larger 2 inch Baader that others are out of stock on. I think they're like $460 American dollars. But thanks.
Quote:It's just basically harder to conduct critical visual tests and comparisons. Bill, you've done a wonderful job sir and I am proud of the wisdom you have provided.
Quote:I have tested high end diagonals as well as low end ones. So far, the prisms I've tested have given me what I believe to be the most pleasing image quality on the planets.
Jeff Morgan - Wile E. Coyote School of Telescope Making
Quote:Quote:I have tested high end diagonals as well as low end ones. So far, the prisms I've tested have given me what I believe to be the most pleasing image quality on the planets. I'm curious if you have ever run across a Newtonian using a prism diagonal?In re-reading some of the old Gleanings For ATM articles from the S&T archive, this was done decades ago.
Quote:I too applaud Bill for doing this perhaps ever deepening test. Whatever results he see's means more to me than bags of theory. As I'm in the market right now for a 2" diagonal for a TEC 140 I hope to have by the Spring, I'm all ears. I'm sure many here have seen this already but here's an article which in part does compare said telescope with a dielectric and prism.http://www.astrosurf.com/laurent/apo140e.htmI think I'm going to have to buy them both to see for myself as seeing is believing....though it doesn't come cheap.......Rod
SteveC TEC 140 Intes Micro 715 deluxe TEC 110 SolarMax 40 Losmandy G-11 w/Gemini, CGEM, Vixen Skypod TEC EP Turret, AP Maxbright, Denk P/S Diagonal, Denk II B/V, EarthWin P/S Slide TMB Supermonos, ZAO IIs, Zeiss Monocentrics, Naglers, 24mm Panoptics, 14mm Meade UWA, 5mm Pentax XO, 20mm ES100, and 2.9mm, 4.4mm, 5.9mm, 7.4mm Couture (ball)
Quote:My first telescope, an Edmund Scientific 4.25" f/10.5, had a prism diagonal, but it was used in an odd way. I guess in 1963 1/8 wave 1" mirrors were uncommon, but 1/8 wave prisms were as common as fleas. So they mounted it on a stalk where the hypotenuse of the prism faced out, was aluminized, and served the same function as a diagonal mirror. The light reflected from the prism's exterior surface, and did not pass through the glass.
C10NGT, Z8, 150 Rumak, XLT 150, C6, C5, SW5 Newt, 4.5 Ball, C102GT, C90, ST80, A70LF; 15x70, 25x100; Burgess BV; Paracorr II; T6 2.5, XO 2.58/5.1, Ethos-SX 3.7, Delos 4.5, TV Plossl 7.4-26, BCO 10, Hutech HC 12.5, Sterling 12.5-25, ES100 14, CZJ H 16/25, CZJ O 16, M5k UWA 24, T5 31, Ultrascopic 35, Titan-II 40; Bino Pairs M5k UWA 6.7, Baader Zoom 8-24, M5k SWA 24, TV Plossl 26, RKE 28.7; Zooms NZ 2-4, NZ 3-6, Leica ASPH 8.9-17.8, Baader 8-24; Baader Zoom Barlow, VIP Barlow
Quote:I've definitely learned is that "seeing" is absolutely crucial in appreciating the differences between certain telescopes and diagonals if optical quality is the focus.
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Quote: I guess in 1963 1/8 wave 1" mirrors were uncommon, but 1/8 wave prisms were as common as fleas.
All MY reflectors are apochromatic. I am personally covered with infrared detectors and emit at 295 Kelvin, 24/7. If I were to recieve a spin entangled photon before you recieved its twin, MY photon would predict your photon's spin. Every time. MY family's lineage goes back over three billion years and has a whole branch of science devoted to studying it... The most Quotidian of observers
Orion Optics 14" f/4.5 Orion Optics 10" f/6.3 Research Grade lambda/10 Orion USA 10" f/4.8 Equatorial Reflector EQ6 Skywatcher 120 ED Coronado SolarMax 60mm Skywatcher 80 ED + Herschel wedge Radians ,Pentax XLs, Orthos , TV plossls , Hyperions...and many others to experiment with.
Quote:Looks like no diagonal won.
Quote:The indoor "lab" test might be exaggerated, but that's fine. It shows us what we're looking for.
Quote: I see a huge difference between straight through and any diagonal, but very little difference between diagonals even after downloading and enhancing the image.
Indiana for a three more weeks...
14.5" Teeter w/ Richard Fagin mirror, TT #66
EON 120ED on CG-5 ASGT
Lunt LS60THa/B1200 Sky Guy Porta II
Denk Super System with A45 OCS
Dark Arts Observatory - Brockport, NY - Skyshed POD XL5 with iOptron iEQ45 Mount
Scopes: C8, C5, SV110 ED, EON-72 ED, ST 80, ATRC6, Megrez 90