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
Homemade 14.5" f4.3 Truss Dobsonian
"I'd like to remind you at four in the morning my world is very still, The air is fresh under diamond skies, makes me glad to be alive." Randy Bachmann "Blue Collar"
“A mind is like a parachute. It doesn't work if it is not open.” ― Frank Zappa
Barnard Astronomical Society
Quote: [Example: 8" SCT at 200X with 82 degree eyepiece: 0.4 degree field of view.12" f/5 dob at 200X with 82 degree eyepiece: 0.8 degree field, or 4X the area of the field in the SCT.
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote: Quote: [Example: 8" SCT at 200X with 82 degree eyepiece: 0.4 degree field of view.12" f/5 dob at 200X with 82 degree eyepiece: 0.8 degree field, or 4X the area of the field in the SCT. Don, i think you must mean a 10mm EP in the SCT @ 82* = 0.40* TFoV, whereas the same EP in the Dob yields only ~150x, and 33% more TFoV.The same magnification in the same AFoV eyepiece will yield the same true field, regardless of the scope driving said magnification... IOW, the net system FL would be the same if the same mag resulted.or something like that?