WO Megrez 90mm, Manfrotto tripod
SW 200mm, EQ5
Nikon Action EX 8x40, Fujinon Polaris 10x50
Garrett Signature 15x70
Quote:Bill, I think with some bright doubles the colours are better seen/more pronounced with less aperture. Almost as if the eye gets over-saturated with light in the manner of a camera sensor with larger telescopes. One I'm familiar with down here is Alpha Centauri, very very bright, and the colours (yellowish and deep yellow, contrasting) I find more obvious with 80mm than with 180mm or 235mm. The bigger telescopes tend to show it as near-white for both stars.
Celestron 8SE XLT Celestron 6SE + Antares f/0.63 focal reducer Celestron SE Goto Mount Kson 1026 ED Carbon Fibre tube Skywatcher Synscan AZ Goto Various EPs (Baader Mk III Zooom, BST, Televue, X-Cel LX)
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
Dave in West Michigan Tasco 10te (1959) 76.2x1200mm Tasco 7TE-5 60x1000mm f16.7 Meade 2045 sct Meade 312 80mmx900 (Japan) Polarex 114 60x900 Jason 313 SYW Yamamoto 60x900mm Orion 10 Inteliscope Dob, Nexstar C6, 102, and 80GT, Ultima C8, Coulter 8 dob, Meade ETX80, LXD75 Pentax 12x42 DCF, 16x50 PCF, Swift 8x40 Pentax ist DSLR, Canon sx110
Friends call me Duane. Compustar C14, Leo Henzl's Custom C8, 6" Refractor Adv. GT mount, 6" F5 Omni XLT Newt., LXD-75 F4 Imaging SN8, Meade 8" F6 Newtonian, EX Dynamax DX6, RV-6 ETX-90 Astro, Meade 2045 4" SCT, B&L 4000 Vixen/Celestron 80mm F11 JC Penny 60mm AZ/ALT Refractor Binos 25x100
Quote:My 4" Nexstar is a Maksutov-Cassegrain style telescope, and has a usable magnification limit of ~200X. Of the eyepieces coming in the standard Celestron kit, the 6mm un-Barlowed hits 221X - I cannot use it without the image being affected.If I run my 8mm eyepiece at a 2X Barlow, it nets me 330X - I see nothing but a blur. Hence, I can only run down to my 13mm eyepiece with my 2X Barlow for 203X - right at my workable limit.At that magnification, I detected a split with Porrima's companion - but closely.At this same magnification, I have yet to be able to split Izar, in spite of several attempts. But, hey! I'm still really new at this. I've seen others post above they've split Izar easily at ~165X magnification. For my own lack of results, though, I'm sure it must be an operator issue... One day I'll see it, and like Porrima, it will just jump out at me like it was there all along.Glad you had a really good night as well.
Quote:... never heard of a green star, maybe an optical illusion caused by the orange primary).Wilfried