TEC140 APO Refractor
Losmandy G11 Gemini 2
SBIG STF-8300M, Atik EFW2 Filter Wheel, Atik OAG, Lodestar Autoguider, Astrodon 1.25" LRGB/SII/Ha/OIII Filters
Scott my scopes: a few refractors (50-102mm), 2 Newts (4.5-12"), and an 8" SCT
Quote:Scott, thanks for the reply. I believe there are collimation screws, but I've never touched them and don't know what to do. What was your solution?
Takahashi FS128, TSA 102, FSQ106N, Losmandy GM-8, Baader Mark V, Leica ASPH, Takahashi, Ethos and Panoptic eyepieces.
Quote:The form of the defect, and that it is limited to the bright stars only, is most suggestive of diffraction. If pinching were occurring, *all* stars would be afflicted.The reason diffractive effects do not show up fir the fainter stars is because there is insufficient light to bring out this subtle effect; only above some brigtness threshold will it appear. An optical defect which arises from a large scale deformation (area wise) must affect even the faint star images as much as the bright ones.
Quote: FSQ cold link Here is the posting I mentioned from the guy in Poland with a similar cold weather issue. (hope the link works, it is to the Yahoo unsensored Takahashi group)Rex
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:Just fill in the missing spots with white-out, problem solved. Now, let's discuss eyepiece cleaning........ Agree with Glenn, have the mfg check the spacers. I'd check the collimation and everything first though. Get a Cheshire or laser and check to make sure the objective and the focuser are collimated first. Has the scope been dropped or the front Objective cell messed with or have you done any mods (i.e. new foucser)?