Thinking About a New Scope? Think Big!
ATM Parts
Large Aperture Mirror Sets
We sell Pro Spec large aperture optics from OMI.
These are the same high quality mirror sets we use in most Obsessions. Made on fine annealed 2 inch thick Pyrex and figured to diffraction limited perfection, OMI research grade mirrors are tested and certified with interferometry to meet or exceed the diffraction limit. Primary mirrors are coated with 96% enhanced aluminum. Secondary mirrors are 1/10 wave from Galaxy Optics and have 98% Brilliant-Diamond multidielectric coating. Secondary mirrors can be purchased separately. These are simply the finest optics and coatings available anywhere.
Primary Mirrors
12.5" f/5 $1,650
15" f/4.5 $2,800
15" f/4.2 $3,300
18" f/4.5 $3,800
18" f/4.2 $4,200
20" f/5 $4,200
25" f/5 $9,500
Secondary Mirrors
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)
$150 per pair plus $20 shipping
20.5 inch diameter arcs
(used on Obsession 15 inch scopes)
$240 per pair plus $25 shipping
24 inch diameter arcs
(used on Obsession 18 inch scopes)
$285 per pair plus $30 shipping
26 inch diameter (with spokes)
(used on Obsession 20 inch scopes)
$325 per pair plus $40 shipping
32 inch diameter (with spokes)
(used on Obsession 25 inch scopes)
$385 per pair plus $45 shipping
38 inch diameter (with spokes)
(used on Obsession 30 inch scopes)
$800 per pair plus $80 shipping
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 or 1.5 inch tubing. Absolutely no other sizes available. Please specify 1.25 or 1.5 inch when ordering.
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 $5 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
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, 1.25, and 1.5 inch diameter tube only. Sorry no other sizes for sale.
$3 each (price includes shipping in US 48).
Split Bolts
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 and postage is included.
Argo Navis™ Digital Setting Circles
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.
See the Argo Navis™ page for more details
"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
See the Publications page for more details
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:
OBSESSION TELESCOPES
PO BOX 804
LAKE MILLS, WI 53551
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.
