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Eight Inch Telescope parts list with purchase links

Here are links to the various parts used in the tutorial on how to make an eight inch newtonian telescope.


Quikrete Concrete Forming Tube 10 " Dia X 4 ' L

Try to buy this at a home improvement store so you don't have to pay the very high shipping costs.


Orion 13031 Basic 1.25-Inch Rack-and-Pinion Telescope Focuser

Basic focuser. And this is the exact one that I purchased from Amazon.




This is a good first eyepiece to get. It is inexpensive and low power. And the low power is very good for a beginner. It will make good use of a home made telescope and give you a wide field of vision which makes it easier for you to find things in the night sky. This particular eyepiece gives my eight inch newtonian a magnification of 36. (On amazon here 1.25 inch and 20mm)



If you are building the eight inch mirror telescope just as I have done. It uses the 10" quikrete tube. Then this is the exact mirror set you want to buy! And it is at a great price. On amazon! You get the 8" Mirror and the appropriate secondary mirror.
(203mm = 8")

Telescope Mirror Set - 203mm Primary & 100mm X 70mm Secondary Mirrors



You Can also get the same properties and size mirror with diagonal on ebay here:

203 mm mirror with secondary



3M 402 Bondo 857 ml Fiberglass Resin


Bondo 488 Fiberglass Mat



3M Paint Project Respirator, Medium


Parts List and Tools:

  • The Primary Mirror (8 inch) Telescope Mirror Set - 203mm Primary & 100mm X 70mm Secondary Mirrors
  • The Focuser (1.25 inch) Orion 13031 Basic 1.25-Inch Rack-and-Pinion Telescope Focuser
  • The Secondary Mirror (Comes included with the primary mirror above)
  • An Eyepiece (here: 1.25 inch and 20mm)
  • The remaining common parts:
  • 1 quart of fiberglass mix, this includes the resin and the hardener
  • 1 square yard of fiberglass cloth. I used very light weight. No need for heavy weight. That is for boat making. Light weight is sufficient and cheaper.
  • The tube - 10 inch quikrete tube that is 48 inches long (Quikrete Concrete Forming Tube 10 " Dia X 4 ' L)
  • 1 piece of 1/2 inch plywood 2'x2'
  • For the diagonal mirror:
  • 18 inches of threaded rod - 8-32
  • nine 8-32 nuts for the threaded rod
  • 1 piece of one inch diameter dowel that is 2 inches long
  • For the Mirror mount:
  • 3 brass flat head bolts that are 1/4-20 and 3 inches long (Brass is optional but they have to be flat head bolts
  • 3 1/4-20 wing nuts
  • 9 1/4-20 flat washers
  • 3 1/4-20 hex nuts
  • 3 springs that will slide over the 1/4-20 bolts. About 1 inch in length. You can get a bag of various springs cheap. Or you can get one long spring and cut it into three pieces.
  • 4 wood screws to attach the mirror mount to the tube (can vary in size)
  • For the Focuser:
  • 4 bolts that are one inch long and 6-32 thread
  • 4 nuts (6-32)
  • 4 flat washers (6-32)
  • 3 small pieces of sheet metal
  • 3 small pieces of cloth or velcro
  • Paint:
  • Flat black for inside of tube
  • Your choice of color for outside of tube. I chose red.

Tools, Drills etc

  • Saw to cut the tube and the wood with. You are going to need some kind of power saw to cut the disk circles. A jigsaw or bandsaw will be good for this.
  • A couple of screwdrivers for the various nuts and bolts
  • A couple of wrenches for the various nuts
  • 2 inch hole saw
  • Various drill bits to create clearance holes
  • A respirator, latex gloves and long sleeve shirt if you are going to fiberglass your telescope tube - The respirator will cost you about 25 dollars.