Rob Astronomy compels the soul to look upwards and leads us from this world to another..... Plato
Quote: I am thinking maybe later doing very limited planitary AP with this Refractor.
Celestron 150 XLT ReflectorCelestron C6-n Reflector102GT-SLTXt6Vixen StarGuy
Quote: Thing is that sometimes, especially when it's this cold, my back hurts too much.
Quote: The Orion 4.7" achromat, with its fast f/5 ratio, is better suited for wide-field viewing of star fields, DSOs and astrophotography.
Starhopping inner city skies
8x30mm, vx80mm f/7.5, sw100mm f/9, wo120mm f/7.5,
µ180mm f/12, vx200mm f/9.75, µ210mm f/11.5,
vx130mm f/5, o254mm f/4.7
ES35,25, 17LVW, 11T6, 7UO, 24-8 zoom
Quote: The gentleman is considering a choice between two achromats, and given the funds allocated for said dilemma, it necessarily excludes the consideration of an apochromat, thus the generality.
Quote: One would have to master the dexterity of a Ouija-board "mystic" to seriously anything with an altazimuth, when compared to the luxury of the consummate, motorised equatorial.
Quote: Quote: The gentleman is considering a choice between two achromats, and given the funds allocated for said dilemma, it necessarily excludes the consideration of an apochromat, thus the generality. He is actually considering a number of choices and open to suggestion. A used ED-80 is within consideration. Any suggestion of using an 120mm F/5 achromat for astrophotography needs to point out that these scope are a poor choice because of the chromatic aberration and increased spectrum involved.Quote: One would have to master the dexterity of a Ouija-board "mystic" to seriously anything with an altazimuth, when compared to the luxury of the consummate, motorised equatorial. Humm... I suspect that I have average dexterity, maybe a bit better than most. I have no trouble with manually tracking for long periods at the sorts of magnifications a 4 or 5 inch refractor is capable of. To my mind it is misleading to suggest that one would have to have the "dexterity of Ouija-board "mystic"" to use an alt-az mount for "serious observation." Tracking mounts are nice in this regard, if they are sturdy and track well, but a decent alt-az mount can be used effectively with a little practice to observe for long periods... Bottom line: Both alt-az mounts and equatorial mounts are viable options. Jon
François C8 f/10, lunt 102 mm f/7 ED. SkyWatcher 12" f/5. pentax XW 40, 30,10 delos 14, 8, 6, 4.5. Vixen lvw 22 Brandon 12, 8 TV 2x barlow Closer and closer to the ideal eyepiece collection, but never reaching perfection
Quote: Thus, an EQ-2 would be a good match for an 80mm, 90mm, or perhaps even a fast-to-moderate four-inch. I never had a need for a motor for the declination, so you'd save money there, too.
One 'scope at a time... "Onward! Ever forward, never straight!" - T. McMahon
Quote:With or without the drive, I still think that 90mm scope and EQ2 mount package from Orion is a solid deal for all you'd be getting! I mean... look at all those guys jumping around up there!Once again, good luck making your choice.
Quote: I think they call that HINDSIGHT!******* I have my ST120 for wide field scanning. I recognise its limitations, and it works fine for me. A 24 Pan @ 25x is a nice combination, night or day. It's relatively compact and easy to get along with. Excellent for quick looks without dragging out the bigger stuff. It's the only 'substantial' refractor I own at present. Planetary? I have a couple good reflectors with ZERO color, that will go to any practical power setting to handle those chores.My 2 cents.M.
C14 XLT, CGE NexSTAR 11 GPS + 120ST APM/TMB 130/780, AT111EDT SW EQ5P (2" Tripod/20" Pier) XW's 3.5mm - 20mm, 28mm RG, TVZ 2-4 ES14mm/20mm 100° UWAN 28mm,Paragon 40mm, TV55, Meade 2X 2" TeleXtender TMB SMC 4mm-16mm, Pentax 0-18, CZJ 0-25 EarthWin PFS-DBSE, WO DuraBright, AP MaxBright TV Bino's Bino Sets X 2: UO H.D's ~ 5mm-18mm, TV Pl.(NJ's)7.4mm - 40mm 16T5's, 24mm Pans Canon 18X50 IS Pentax 7X35 (9.3°
Quote: It's a shame that that particular achromat cannot be had as an OTA.