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ATM Parts

Secondary Mirrors

We sell Pro Spec Secondary Mirrors from Ostahowski Optics

Secondary mirrors are 1/10 wave from Ostahowski Optics and have 98% Brilliant-Diamond multidielectric coating. Secondary mirrors can be purchased separately. These are simply the finest optics and coatings available anywhere.

2.14" $225

2.6" $250

3.1" $275

3.1" $275

3.5" $425

3.1" $275

3.5" $425


Side Bearings

Solid cast aluminum side bearings

Note: You supply the laminate of your choice.

18.5 inch diameter arcs
(used on Obsession 12.5 inch scopes)
$175 per pair plus $40 shipping

20.5 inch diameter arcs
(used on Obsession 15 inch scopes)
$285 per pair plus $50 shipping

24 inch diameter arcs
(used on Obsession 18 inch scopes)
$325 per pair plus $60 shipping

26 inch diameter (with spokes)
(used on Obsession 20 inch scopes)
$375 per pair plus $70 shipping

Side Bearings

Upper Truss Tube Clamps

upper truss tube clamps

upper truss tube clamps

Same cast aluminum clamp assemblies we use on our 15, 18, 20, and 25 inch Obsessions. (as shown on pages 238, 240, 241 in The Dobsonian Telescope book) Includes the pole seat, clamping wedge, hitch pin, flat ended bolt, cam lever.

If you are building an Obsession style Dob, this is the best money you'll ever spend to get these hard to make upper truss clamps.

Only made for 1.25 inch tubing. No other sizes available.

Also, we do NOT sell the lower wood clamping blocks we use on the mirror box. Sorry, you'll have to make those.

Set of four $150 plus $7 postage (US 48).

Etched Virgin Teflon

Same Teflon used on all Obsessions. 0.093 thickness. Acid etched on one side so it will accept an adhesive like contact cement or epoxy. No nails needed. Sold only in 6 x 12 inch sizes. Score with a sharp knife on the back side and it breaks into perfect pieces.

$95 plus $6 shipping.

Tube Inserts

tube inserts

Threaded push fit tube inserts

Press fit into the ends of aluminum tubing, they allow you to connect the wood cage rings to the struts.

For 1.0 and 1.25 inch diameter tube only. Sorry no other sizes for sale.

$3 per insert plus $7 shipping for any quantity to any US destination.

Split Bolts

split bolt

7/16 by 2" long machine bolt has a length of 2 1/4" long flat stainless steel welded to the end of it with a 2" long laser cut slot in it. No need to hack saw anything.

$15 per pair plus $7 shipping ($22 total) to any US destination.

Argo Navis™ Digital Setting Circles

Argo Navis remote

The "Argo Navis™ digital setting circles" are the most advanced DSC in the world. Now you can have over 29,000 object at your finger tips, flash memory, highest navigational accuracy and much much more. It even corrects for mount errors and atmospheric diffraction! With the Argo Navis™ you will target and observe ten times as many objects during the night than with a traditional finder.

We are an Argo Navis™ dealer and usually have the Argo Navis and super 10K res encoders in stock.

"The Dobsonian Telescope"

"The Dobsonian Telescope"

By Kriege and Berry

Highly recommended for all Dob builders.

Save hundreds of dollars and learn how to build the best scope possible.

"It belongs on the shelf of every amateur telescope maker, and for that matter every Dobsonian owner. With its whimsical style and thorough treatment of the subject the book is destined to become a classic...
"Sky and Telescope, October 1998

Ordering Info

Sorry we are not set up for credit cards. To order, please send a check to cover the total amount plus shipping (US destinations only) to:

PO BOX 804

If you have any ordering questions please send an email. NOTE, foreign orders (outside United States) please send an email so we can determine shipping costs before you place your order.