"You're not afraid of the dark, are you?" - Riddick "The best scientists are humble. They seek to understand, not to ensure their legacy, but merely to understand." - Mori
"Coffee leads men to trifle away their time, scald their chops, and spend their money, all for a little base, black, thick, nasty, bitter, stinking nauseous puddle water." ~The Women's Petition Against Coffee, 1674If it ain't broke, fix it 'til it is.
Quote:A Starfire 130 EDT has come up for sale here in Denmark. And no, before you guys go on cheering me up to buy it, I can't afford it. However, a discussion has broken out on the forum where it has been offered, about whether this particular scope was air-spaced or oil-spaced. I claim that all EDT's were oil spaced (apart from the 155mm f/9 prototype) and that it's the EDF's that were air-spaced (because they were much faster f/ratio). Others claim this one is air-spaced. The lens cell clearly say: 130mm f/8 EDT. It's NOT the later 130mm f/8.35. So, who is right? I'm fairly sure I'm correct here. Also, the fairly good pictures we've seen of the lens show no hint of spacers.Links to solid documentation I can use to beat them with (or myself!!) would be much appreciated! Clear skies!Thomas, Denmark
Clear skies, Erik
Visual astronomer since 1978.
Matthias Wirth 16" f/5
Takahashi FS-102 NSV on EM-10
Celestron 1983 C5
Zeiss, TeleVue and Celestron eyepieces
Nikon 18x70 IF-WP Zeiss Victory FL 7x42 Zeiss Victory FL 10x32
Roberto Botero, Kent, UK
Quote:The faster EDF' s from 1996 and younger are definitely all oil spaced.The first fast 130's at f/6 were called officially EDFS as per Astro-Physics literature (as in short), as opposed to the EDF that was still f/8 (= "longish") at that time. Later on, the 130mm f/8 were no longer made due to the small demand for f/8 and high demand for f/6 lenses. With now only one 130mm in production (the f/6) there was no longer a need for 2 names.
StarStructure 24" f/3.3 | ServoCAT/Argo Navis
Astro-Physics 175EDF | AP1100GTO | ATS Portable Pier
Psalm 19.1 - A Psalm of David. "The heavens declare the glory of God, and the sky above proclaims his handiwork".
Quote:I am pretty sure there are some air-spaced 178 f9 starfires out there. The AP literature from the time listed it as an option along with options for color correction...better corrected for visual or at the time photography. One of the 178s that came up on Amart recently appeared to be air-spaced based on the images of the lenses.
“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
Scott my scopes: a few refractors (50-102mm), 2 Newts (4.5-12"), and an 8" SCT
Quote: After discussion by the moderator team and some judicious editing, this thread is now being returned to the forum. Let's please keep this thread on topic and continue to discuss AP objectives. This is not the place to discuss the policies of Astromart, Anacortes Telescope, or Herb York. Thanks!