Orion Starblast 4.5 inch reflector
Rokinon 8x42 Binos
Nikon Aculon 7x35 Binos
The Mass of Uranus is 86,810,300,000,000,000,000,000,000 kg
Astro Sky 17.5 Dob
Zhumell Z10 Dob
ES AR127 & Jason 60mm (Towa Optics) on Twilight-II
ES 82 deg 24, 18, 14, 8.8, 6.7, 4.7
Astronomers: We look into the past to see our future.
My eyepieces are made from the waste product of exploding stars. 10XTi 102XLT ST80A(2" Focuser) XW: All; XO: 2.58 Televue: Naglers-T1 Smoothside-full set, 17T4,12T4,Ethos 17,4.7; plossels-40,32,20,17,&7.4mm; Pans-22,24mm; Delos-6,8,12,17.3mm ES100: 5.5,9*,14,20 ES82: full set ES68: 16,20,24,34 NLV: 5,9,10,15 Ortho: HD-7,9; OPS-9,12 Meade RG 7mm Other: Pentax 12.5K(.965), 10mm Parks Zoom: Nag3-6 *=on b/o DAS Dark Site
Quote:Do Orthoscopic eyepieces give you more contrast?
I ache, therefore I am
Quote: lower contrast due to more of the light scattered at the surfaces reaching the eye.
Quote: Quote: lower contrast due to more of the light scattered at the surfaces reaching the eye. Why would there be so much more scatter in a Plossl?
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.
Refractors Reflectors Two Cats A few eyepieces
Quote:Actually if you look here:http://www.telescope-optics.net/eyepiece_aberration_2.htmYou'll see that the orthoscopic eyepiece has better multi-color spot plots than a symmetrical (what everybody currently and incorrectly calls a Plossl) at f/5 and f/10. In short focal lengths, anything less than 9.7 mm., the symmetricals have way less eye relief that an ortho and are basically unuseable. And finally the ortho has a distortion free field. That's what orthoscopic means.
Quote: I tried a 3mm Zhumell Z series planetary eyepiece for 150x, but the image wasn't sharp enough with my fast scope.
8 f7.62 eq. 12 f5 Dob
Barly my 10 yr old faithful Bichon pup.
Quote:Quote: I tried a 3mm Zhumell Z series planetary eyepiece for 150x, but the image wasn't sharp enough with my fast scope. Possibly collimation is out, seeing is bad, or the mirrors are not figured to a very high accuracy.In the latter case it's like trying to get 400 hp with jet fuel out of a 4 cycle lawnmower engine with a collasped piston, a couple of burnt out valves and a rod that's just keeps knockin on your door. Sam
Quote:I have just purchased a pair of 11 mm TeleVue plossls and they are pain to use in a binoviewer. There's simply no eye relief, with or without the rubber eyeguard - I don't see the whole AFOV. (No problems with one though.) Maybe it is my personal anatomy but I find 10 mm Carl Zeiss Jena orthoscopics to be worlds more comfortable eyepieces, at least for the bino mode.
Quote:What if I use a barlow? I'm particularly interested in using a 9mm eyepiece with a 3x barlow to get 150x in my f/4 scope for planetary viewing. I tried a 3mm Zhumell Z series planetary eyepiece for 150x, but the image wasn't sharp enough with my fast scope.
Quote:Seeing is a fickle thing.. one night your scopes seems like a wizard, everything is magically sharp and clear. The next night, you wonder what has gone wrong with your scope.. The key is not asking for more than the sky can give, not asking for more than you scope can give and just enjoying what they do give.Jon Isaacs
• Celestron Ultima 8, f/10 • Zhumell Z12, f/4.9 • Intes MK-67, f/12 • Celestron C5 Orange Tube, f/10 • WO 80mm Fluorite APO, f/6.9 • Carton 60mm ATM, f/16.7 • a few Plössls, a few Orthos, a few Königs, an Erfle or two, a few SWA, a few UWA, a couple SUWA... • CG-5 ASGT, CG-5, & AT Voyager "It's amazing what you can see if you look... " Yogi Berra
Quote:What's the deal with Orthoscopic eyepieces? Are Orthoscopics better than Plossls? I've never used one. I saw a Baader 10mm Orthoscopic eyepiece that looks interesting. It has a 50 degree AFOV, compared to 42 degrees in some other Orthoscopics. Would this eyepiece be better than an 11mm Tele Vue Plossl around the same price?
Bill 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.
//Anders 8" EdgeHD Skywatcher Equinox 120 Pro 80mm f/6 TS triplet APO
Quote: Spot sizes are smaller and better controlled in the Abbe design when compared to the Symmetrical design
Quote:Quote:Actually if you look here:http://www.telescope-optics.net/eyepiece_aberration_2.htmYou'll see that the orthoscopic eyepiece has better multi-color spot plots than a symmetrical (what everybody currently and incorrectly calls a Plossl) at f/5 and f/10. In short focal lengths, anything less than 9.7 mm., the symmetricals have way less eye relief that an ortho and are basically unuseable. And finally the ortho has a distortion free field. That's what orthoscopic means. I am optical designer and can say the following:(1) do not pay too much attention to the spot plots on the linked source. Using adequate glasses and the same quality criteria both optical design could be developed with almost the same quality of the image (on axis and in field);(2) orthoscopic design potentially has ability to get rid distortion and provide longer eye relief, but actually both features make aberration correction far from optimal and designers prefer to do not pay attention to amount of distortion and how large is eye relief focusing of image quality; as result astronomical Plossl and Ortho have a little difference in these topics. (3) orthoscopic design require higher level of manufacturing culture and more expansive to vendor; Plossl is an opposite - is rather cheap and it selected by manufacturers who is looking for way to reduce cost: using cheaper glasses, not so expensive mounts, not so precise mechanics, cheaper coating... etc. So pure quality is more Plossl feature, then Ortho
Quote:I read these kinds of things all the time (Plossls have more scatter, Abbes have tigher spots) and from a pure design perspective, everything I have ever seen or read suggest that the desings themselves will perform the same on axis.When people make these claims, I would love to see thier references that support them.
Quote:penguinx64 if you are going to barlow use a Powermate
Orion Xt6i, Orion Xt8i, Sky-Watcher 10