Cactus Patch Observatory / 14" LX200
"The four points of the compass be logic, knowledge, wisdom, and the unknown. Some do bow in that final direction. Others advance upon it. To bow before the one is to lose sight of the three."
Celebrating the 30th anniversary of the USFL, when football was more than a game.
That's me in the avatar running back a pass I intercepted for a touchdown
Skywatcher 120ED Refractor Assorted Zhumell Planetary, Skywatcher and ES eyepieces, a 2x barlow and a few filters. iOptron MiniTower II Sony NEX 3 for astrophotography
Quote:The 120ED will do great on planets, splitting double stars, including tight doubles (try that with the dob) and DSO's. It won't require constant collimation nor will it suffer from cool down issues like the dob.
Quote:One last thing to consider. Planets move fast. With the 120ED you can mount it on a goto setup and track the planets while observing. The mount will keep the planet in the center of your eyepiece. With the big clumsy dob you'll constantly be having to nudge the thing every few seconds. Dobs are better for DSO's because of the light grasp and because DSO's move much more slowly through the eyepiece and require fewer adjustments. But you said your primary goal was to view planets, which move quickly out of the FOV so a goto tracking mount is your best option, which means the 120ED scope.
I ache, therefore I am
.... back yard astronomer ================= Don't forget to look at the moon often. Its a play ground of fun if you throttle up the magnification!
Joined June 2012: Location, Ottawa, Ontario
Mes télescopes et jumelles:
150mm F5 Newt on EQ5, 127mm Mak Cass on AZ4
Oberwerk BT70-45 and 15X70 SkyMasters
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...
The night sky is the canvas....
My optics are the brush....
The Milky Way is the masterpiece
reductio ad absurdum of epistomology is solipsism....
Refractors Reflectors Two Cats A few eyepieces
Quote:8" F6 with decent mirrors and a 25% obstruction will eat an 120mm ED for lunch. Proper collimation is a must but it's a no contest. 6" F8 with a 20% obstruction? Still better but close. A 100-120mm scope is better in poor seeing. My 4" F15 Jaegers is often better than my 6" F10 Jaegers on poor nights. Poly strehl on the 6" F10 isn't great either. My 8" F6 newt is a good bit better on good nights with proper cool down. (0.98 Strehl)