MarkLeica 8x20; Nikon Action 7x35; Vixen Apex Pro 8x42; Orion 15x63; Docter Nobilem 15x60WO Megrez II 80 FD / APM 107mm f/6.5 / Mewlon 210 on DM-6 + Berlebach Planet
Equipment: SCT C14 - for sale * TSAPO65Q * ASI120MM * Atik 314L+ * and more
WWW: My Astro website
Quote:Mark,Your link is to the older - achromatic refractor not to the new TAL 125r APO refractor.
Tal 200K Klevtsov, Tal 2M, Tal 1, Tal M, Tal Alcor, Burgess 90mm Fluorite, PZO T50x70, Carton 60/1000. Too many eyepieces and mounts.
There is information about new Russian APO Refractor.
That is 6 elements unusual construction.
A few telescopes of dubious value. Understanding wife and two curious cats. "Semper ubi sub ubi"
npz 8x50 seeker
18x50 beer bottle telescope
wo zs 66sd on modified synta AZ3 (strehl 0.97)
Sky-Watcher 100ed refractor on old HEQ5 ( strehl ratio 0.98 based on roddier test)
300PDS OTA (on homemade dobsonian mount)
Jim Santel MK91 Astreya-SAPO
Quote:I spoke to Andrey he said "it's new APO (Apolar-abbreviation from apochromat of Russian amateur of astronomy) from NPZ. It's APO with normal glasses only. There is no one glass with ubnormal dispersion in the design."He also said they are comming out with a 152mm. Andrey produced a 5 element 4" apo with no ubnormal elements.I recall some other designer said it couldn't be done
Quote:It was Wolfgang Bush who develope the oiled triplet. B270 and KzFN2, But this was considered a semi, but I believe the KzFN2 is a abnormal flint. web page My first scope AP 127 f/12 KzFS-1. The KzFS-1 is a abnormal flint glass though and was used in the super-planetary series, I believe it was oiled. I'm not a AP buff, I only had a few of their scopes and never took a picture of that one. I will let Andrey know about your post.