“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
Quote:I recall reading this...http://www.astromart.com/articles/article.asp?article_id=793
Quote:Quote:I recall reading this...http://www.astromart.com/articles/article.asp?article_id=793 Thanks,That's a surprising report. Bill
Quote:"RKE" stands for "Rank Kellner Eyepiece". It is pretty much a standard Kellner reversed. Dr. Rank also designed the eyepiece you linked, allegedly, but it's *not* and RKE despite Edmund slapping "RKE" on it. It's just an Erfle. Calling an eyepiece an "RKE Erfle" is like calling an eyepiece a "Plossl Abbe Orthoscopic".
I've been wanting to try one of these for a long time, but $225 for an Erfle always seems a little steep. I have an excellent 2" Meade 32mm Research Grade Erfle, and it cost me about $100. If you go for it, keep us posted.
5" F/9 1st-gen "blue" AP StarFire on Dobbins GEM Mount 6" F/15 J.W.Fecker Refractor on - I'm not sure yet 5" Classic Orange C-5 - with lots of old stuff 10" Meade DS-10 - w/LEATHER end caps 12" LightBridge - extensively moded Jason 60mm Discoverer Model 313 Meade ETX-90EC with Autostar Way too many other 60 mm's Fujinon 6x30 FMTR-SX bino 8' Exploradome with Bay 1st Gen Smoothies - All 5
-Gary C11, C8, ED80, TV-85, SW120ED, 6"Cave F/8, Solarmax 40, DM-6, Losmandy Titan 50 GEM, 7x50 Nikons, 15x70 Astrophysics, 16x70 Fujinons, 22x100 Oberwerks, Sim Picheloup CPT, Canon 40D, SXV-H9, DMK 41AU02, DBK 21AU618 Fairview, Texas "There is only one constant in our infinite universe; it is change."
Meade 305 ƒ/10.4 LX200 • Royce 250 ƒ/19 Dall Kirkham • AstroTech 250 ƒ/8 RC • AstroTech 250 ƒ/4 "RFT" Newtonian • Meade 80 ƒ/6 ED APO • TEC 140 ƒ/7 APO • Orion 180 ƒ/15 Mak Cass ... Denkmeier II binoviewer - Nikon 8x60 binocular
Astronomical Files from Black Oak Observatory
Quote:we must all marvel at the scope of action that allows marketers to retrofit the designation "RKE" (reverse kellner eyepiece, not rank kellner eyepiece) to apply to a design that has nothing to do with either rank or kellner.
Quote:"It comprises 3 achromats and is tack sharp."
Quote:Quote:"It comprises 3 achromats and is tack sharp."somebody should let astronomers know that tacks are not really very sharp.
Scopes: Celestron Nexstar8GPS SCT; ES David Levy Comet Hunter 6" Mak-Newt; Vixen ED100sf; Astro-Tech AT90EDT; Stellarvue SV80-9D; Monolux/Carton 60/910 Finders: 80mm S'vue Aplanat/C8, with Telrad; S'vue 60mm/AT90; S'vue 50mm/Vixen; OEM/ESDLCH; EPs:TV: Radian3,4,5,6,12,18; T6 5,7,9,13;16,26,31T5;Pan24,35; plossls: 3-6NZ,8,11,15,20,26,32,55; Sterling plossl1.25" 12.5,17,20,25. 2"30,40; A-T TitanII30; TMB Paragon40; Celestron Ultima35; Sterling FF27; TMB Planetary 6,7,8,9; KK ortho set
Evidence refutes liberalism. The Earth's eco-system is not fragile. Evolution cannot explain creation. Communism kills. All by Rush Limbaugh. Criterion Dynamax 8, Bausch & Lomb 4" SCT, Meade LX3 4" SCT Model 2045. Criterion and Bausch & Lomb eyepieces, CP4 Barlow. Meade 2X apo Barlow, Intes 2.6 Micro Barlow, RKE 2.5x Barlow, Russell Optics 14mm Konig. Mark Swanson.
Quote:"RKE" stands for "Rank Kellner Eyepiece". It is pretty much a standard Kellner reversed.
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:"It is sharper on axis than any plossl, 1RPD, Proxima,etc.."
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:Yes, but we didn't know about that document in early 2011, and have discussed it subsequently in a different thread, after the post you're responding to.