Used acronyms: NEML=Naked Eye Magnitude Limit, SQM=Sky Quality Meter, TML=Telescope Magnitude Limit, CO=Central Obstruction, delta_m=difference in magnitudes between double star components, RoT=Rule of Thumb, pD_mm=proposed D_mm for resolving a binary (ident with earlier used pA=proposed Aperture), D_mm=Diameter (of scope) in mm, UCAC4=USNO CCD Astrograph Catalog 4th edition
--------------------Clear Skies, PJ Refl.- 203/1420; Refr.- 110/616, 75/500; Bino.- 15X60, 10X50, 8X30 __________________________________________________
Clear Skies, TonyScopes: Celestron 150mm SCT, ES 102mm refractor, 114mm Newt, Circle T 80mm refractor, Cel./Vix. 60mm refractor "the Brute" EP's: Various and sundry along with barlows WO and ES Dielectric Diagonals Filters: DGM Optics NPB, Orion SkyGlow Filter, color and longpass AstroZap Dew Shield, Vibration Pads etc... AstroPlanner V2.1, SkySafari 4 Plus, Vortex 8X42, 60's 7X35 Binocs Astronomy in the Orange Zone! ...73 de KM5JH...
Quote:I like my 4" scope for everything so I am biased.Here is a short bit from the Cambridge Double Star Atlas:It has been often stated that the person behind the eyepiece of a telescope is far more important than the size or type or quality of the instrument itself.
Quote:...But if I'm just looking to enjoy maybe the top 100 doubles and don't have much interest in the challenge of splitting really tight doubles or searching out very faint doubles, is there much of an advantage to using something like a 120mm long focus refractor over an 80 or 90mm refractor?
Quote:And if I go with a 90mm, would an APO be a significant improvement over an acro for double star viewing? Or wouldn't there be a huge difference?
C-11 SCT, XT10i Dob, C-6 SCT, ETX125PE Mak-Cass, TV102, & AT66
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