Quote: As others already mentioned here, they are 27mm focal length eyepieces, made for medical surgery.
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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 think the field stop on these eyepieces would be too large for my Burgess Binoviewer. I am afraid they would vignette.
Quote: The ad says that the eyepieces have a 36mm female thread. Are 1.25" barrels available to fit this thread size?
Quote:Well, the field stop is 22mm. There is no vignetting in my Baader Maxbrights.
Quote:The thread is actually a little larger than 36mm. My caliper says 36.7mm. The threads are fine, about 0.75mm. I thought that there might have been a chance (before I measured them) that they would fit Vixen M36.4x1 threads, but they didn't.
A local machinist can likely make some 1.25" barrels for them. You could also contact B+W optics, who (used to?) sell them, equipped with 1.25" barrels. Another alternative is APM telescopes.
Quote: A machinist's labor can add substantially to the total cost. I avoid them like the plague. My pockets aren't that deep! If someone has a friend that can do work like that on the cheap, go for it.
I think it'd be best to deterimine if barrels are available off-the-shelf before anyone - at least anyone with modest means - buys a pair of the "screw-in" eyepieces. A machinist's labor can add substantially to the total cost. I avoid them like the plague. My pockets aren't that deep! If someone has a friend that can do work like that on the cheap, go for it.
Quote:I was indeed thinking more in line of "a friend with a lathe", rather than "professional machine shop"!
Quote:The film canister trick works just fine for Eps with microscope barrels in place - assuming you can find them (I still shoot 35mm film). It may not be elegant but the fit is pretty remarkable over the 30mm (1.18") standard microscope barrel of the Zeiss and brings it out almost to 1.25". This is how I use my Zeiss eyepieces with my Mark V. The Mark V eyepiece clamps center and hold them in place very well - there is just a minimal amount of play with the film canister before clamping but they don't budge after tightening.
Quote: How would the Zeiss compare to these?PAIR WF 10X PLAN EYEPIECES
//Anders 8" EdgeHD Skywatcher Equinox 120 Pro 80mm f/6 TS triplet APO
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.
EON 120 Zeiss micro eyepiece maniac: PL 10x18, PL 16x16, 25x10 Zeiss 68deg Diascope eyepieces: 12.8mm, 16.5mm, Brandon 12mm Zeiss Jena microscope binoviewers ES: 24mm 68deg, 31mm 82deg
Quote: Just to be totally clear - you're not recommending the KPL or EPL eyepieces for astronomical use?