Orion XT8i Dob 9x50 RACI Finder TELRAD Reflex Sight Agena SWA 38mm 70 FOV 2" EP Orion 25+10mm Sirius Plossl 52 FOV EP ES 82* 11mm, 18mm 2" ES 68* 24mm 6mm, 25mm Ortho. EP Televue 3X Barlow Filters Baader Continuum, UV/IF cut, Lumicon UHC, DGM OIII. SkySafari T-Ring and Adaptor for Olympus E-510 Oly sz-14 SteadyPix Deluxe iOptron SkyTracker 7.7lb Electro Dot Sight RD400X http://www.astrobin.com/users/NeilMac/
Quote:Through the viewfinder the image is nice and sharp but when I take a shot it's quite blurry. The camera is set to 800 iso 1/200th of a sec, so there's no chance the moon is moving during the exposure or is there?
Leica 8x20; Nikon 7x35; Vixen 8x42; Orion 15x63; Docter 15x60
WO Megrez II 80 FD / APM 107mm f/6.5 / Mewlon 210 on DM-6 + Berlebach Planet
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:Second thought, maybe that 3X barlow is too much magnification for that 5 inch reflector, that might be the reason for the soft image.
Quote:I already use a 10 second delay, so I suspect the bump doesn't help.
LX850 blog: www.LX-850.com
personal website: www.wadsworthobservatory.com
Quote:You can't rely on viewfinder focus for several reasons. For one, as has been mentioned, that is adjustable and may or may not be properly adjusted to agree with the chip. For another, it simply isn't as precise as you would require. The primary reason, though, is that your eye can accommodate a range of focus positions so even when it's out of focus your eye can correct it to appear in focus - but the camera chip cannot.A focus mask can compensate for the above to some extent - but a certain method is to look at what the chip is seeing. Short test shots are the way to go. Bear in mind - dedicated astro cameras have neither viewfinders nor "live view" but they are easy to focus via test shots.Shutter shock and/or mirror slap are possible, but as your focus method can't be trusted, and as the shot appears out of focus, I'd fix that first.
Quote:It is common practice to set the focus on a bright star using a focusing mask (Hartmann or Bahtinov) then slew to the moon.
Rob Astronomy compels the soul to look upwards and leads us from this world to another..... Plato