Free Obsession DVD product Video To obtain a hard copy of Obsession literature including our 120 minute product video, e-mail your POSTAL address, or fill out this form and we'll mail it to you at no charge (World-wide). The video is great for determining which aperture is best for you. Yes! We sell Newtonian optics for big Dobs (see below). We also sell side bearings, upper pole clamps, and tube inserts. These are the same components we use on our Obsession telescopes. 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) $215 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. Set of four $130 plus $5 postage (US 48). 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. 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. $50 plus $8 shipping. TUBE INSERTS Threaded push fit tube inserts $3 each (price includes shipping in US 48). 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. 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! For complete product description please click on the Argo Navis link above. With the Argo Navis you will target and observe ten times as many objects during the night than with a traditional finder. more information We are an Argo Navis dealer and usually have the Argo Navis and super 10K res encoders in stock. The Argo Navis DSC computer with acrylic holder (computer only, no encoders) is $485 plus $10 shipping. The Argo Navis DSC with high res encoders, mounting hardware, cables and acrylic holster is $835 plus $10 shipping. Order now and get going on those 29,000 objects! THE DOBSONIAN TELESCOPE Highly recommended for all Dob builders. Save hundreds of dollars and learn how to build the best scope possible. more info. By Kriege and Berry, $32.95 (price includes shipping in US 48). "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 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 Torus 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 Secondary 12.5" f/5 - $1,650 2.14" - $225 15" f/4.5 - $2,800 2.6" - $250 18" f/4.5 - $3,600 3.1" - $275 20" f/5 - $4,200 3.1" - $275 25" f/5 - $9,500 3.5" - $425 NO WAITING!!!!! Above optics are usually in stock for immediate delivery. Please email or call for availability and shipping costs. PLEASE NOTE: The apertures, focal ratios, coatings and secondarys listed above are fixed. Other apertures, focal ratios, or coatings NOT OFFERED AND NOT FOR SALE. 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.