Astronomy

After considerable research, it seems Discovery Telescope's 8" f/6 Dobsonian was the best deal. I checked numerous web sites and the opinions of several amateurs on sci.astro.amateur. The customer service at Discovery has been unparalleled in every way even going as far as exchanging a diagonal that I scratched. They have a customer for life!

Immediately after obtaining my telescope, I made several small modifications to it:

8 in. Reflector
I marked the bottom plate every five degrees. I then drilled a hole on the top plate so I can read the azimuth readings below. A couple of AA batteries, a momentary switch, and a high efficiency red LED are used to light the area.

I also added a handle so I can move the base around with one hand.

crude azimuth system
An even cruder altitude system is made by using velcro to attach a protractor to one of the bearings. crude altitude system
A small foam pad was hot glued to the front panel brace just in case the scope should ever tip straight up too fast. The pad will cushion the scope.foam pad
A couple of lashing straps and a piece of mountaineering rope form a handle to carry the scope. Credit to Jim Mueller for this one. Carrying handle
Altitude bearing tensioner to eliminate some of the rebalancing when changing eyepieces. Made from a 5" diameter hose clamp. Picture above shows clamp pulled out so scope can easily be moved in and out of the base. Credit to Mark Fadale for this one. altitude bearing tensioner
Center spot on primary mirror greatly assists in collimating scope accurately. Center spot on primary mirror
Digital camera view through focuser. Camera parallax is throwing view off slightly but you can see the secondary is centered in the focuser as are the reflections and center spot. Collimated view through focuser
Not shown: "Magic slidersŪ" (teflon pads) were added to the base to smooth out azimuth motion. I used the 1" circular pads. Three on the outside and three on the inside near the center bolt.

Accessories:

  • Plossl Eyepieces [* - favorite & most used]:
  • Barlow: Celestron Ultima 2X
  • Finder: Telrad & Celestron 6x30
  • Flashlight: AAA battery Mini Maglite: remove the bulb and put a red LED in it!
  • Tools: Astro Systems LightPipe/SightTube combo, Tectron autocollimator, Kendrick laser collimator
  • Books: Nightwatch & Cambridge Star Atlas.
  • Filters: Lumicon UHC (improvement seen in M42)

    Observations:

    After learning to recognize key elements in the sky, I found locating objects much easier. The sage advice of learning the sky with binoculars is true. I'm still using them.

    Having just started this hobby, I have observed the Double-Double (as 2 stars so far -- where's the others?) in Lyra, the double at Albireo, M57, M31, M42 (5 stars in Trapezium but not F yet), Jupiter, Saturn, Venus, and Mars. I have got a lot to find yet. The seeing from home is pretty bad. With the naked eye, I can just make out stars that are in the magnitude +4.5 range.

    Astro(V1.1): LD A(8") r l+ c O- DS->+ PL-->+ F M P>++ T D U+ S--- W !E

    Last update: 30-JAN-2001