Antares 2" Low-Profile Dual-Speed Hybrid Reflector Focuser (Rack and PInion with Linear Bearings) - FGLP

Upgrade the focusing precision of an 8 or 10 reflector telescope with our new Antares Low-Profile Dual-Speed Hybrid Reflector Focuser. Its new, innovative hybrid design incorporates the benefits of both rack-and-pinion and Crayford focusers to provide superb fine-focus performance for 8 and 10 reflector telescopes. Building on the rock-solid reputation and performance of the well-regarded Crayford design, a unique helical spur on the two-speed focus mechanism provides increased positive control of the drawtube while minimizing backlash and slippage. This allows the Orion 2 Low-Profile Dual-Speed Hybrid Reflector Focuser to hold heavy payloads of observing or astrophotography accessories without slipping, while still offering the smooth, backlash-free motion of the traditional Crayford model. This hefty focuser tips the scales at 14 oz. can hold over 16 lbs. (~8kg) of payload and still provide smooth, slippage-free motion.  

With a low-profile racked-in height of just 58mm, the Hybrid Focuser features a built-in 43mm extension tube for enhanced versatility, and has a total racked-out height of 122mm. Featuring dual-speed controls; this beautifully machined focuser lets you achieve just the right amount of focus using its fine-focus knob which has an 11:1 fine-focus ratio.

Featuring a 2 drawtube, the Antares Low-Profile Dual-Speed Hybrid Reflector Focuser comes with a 1.25 compression adapter for use with high-power 1.25 eyepieces and 1.25 accessories. The main drawtube has 8 precision roller bearings to support smooth operation and a knurled focus lock knob. The fine focus knob boasts an 11:1 reduction in speed for those moments when you need just a minute adjustment to obtain perfect focus. 

The beautifully machined Hybrid Focuser is a mechanical masterpiece that is a joy to use and gorgeous to behold. Lock it down for astrophotographic pursuits, or adjust the tension control for fine adjustments during observational stargazing sessions. 
 

Description:

• New model with gear drive for heavier lifting capacity
• Premium 2" Dual Speed Low Profile R&P Focuser for Newtonian/Dobsonian reflector telescopes
• Made by Long Perng (same product as Orion focuser), a leading manufacturer of premium telescopes and accessories
• 11:1 fine focus control for backlash free and image-shift free focusing
• Includes integral 2" extension tube for additional back-focus travel if required
• Features drawtube tension adjustment and focus lock screws
• Includes 1.25" eyepiece adapter
• Will fit 8" or larger tubes, as well as flat tube surfaces. Drop-in replacement for many Orion Newtonian and Dobsonian telescopes, including Intelliscope dobs (will not work with SkyQuest XT8 Classic Orion dob sold before 2007 unless you drill new holes, or some models of the XT10i). Please use the information below and in the photos to confirm whether this focuser will work with your telescope.

Specifications:

All measurements below are measured from the bottom end of the flat base plate. There will be an additional gap of 1-2mm between this base plate and the telescope tube which will depend on the diameter of your telescope tube.

For use with 2 eyepieces and accessories (without 1.25 adapter):

• Focuser travel range: Minimum Height = 1.89 (47.9mm) and Maximum Height = 4.54 (115.3mm)
• Minimum focuser height (with 2 extension tube collapsed) = 1.89" (47.9mm)
• Maximum focuser height (with 2 extension tube collapsed) = 2.85" (72.5mm)
• Minimum focuser height (with 2 extension tube fully extended) = 3.62" (92.0mm)
• Maximum focuser height (with 2 extension tube extended) = 4.54" (115.3mm)

For use with 1.25 eyepieces and accessories (with 1.25 adapter):

• Focuser travel range: Minimum Height = 1.98 (50.2mm) and Maximum Height = 4.63 (117.6mm)
• 1.25" low profile adapter only adds 2.3mm to the above 2" measurements
• Focuser includes a 1.25 collet that can be used for added extension. This can add up to 0.85 (21.7mm) to all the above 2 heights. However, it can skew the optical axis significantly and is not recommended for frequent or imaging use.

 For use with any 1.25" or 2" eyepieces and accessories:

• Drawtube travel is 24.5mm (almost 1")
• Integral drawtube extension can be used to add 44mm (1.7") of additional back-focus travel, so total tube travel is 68mm (2.7")
• Mounting hole pattern is 54mm (2.125") along optical axis and 90mm (3.56") perpendicular to optical axis
• Focuser weight (without 1.25" adapter) = 1lb-13.0oz (822gm)
• Focuser weight (with 1.25" adapter) = 1lb-14.8oz (873gm)
• Focus knob diameter = 1.49" (38mm)
• Microfocus knob diameter = 1.10 (27.8mm)
• Maximum outer barrel diameter = 3.31" (84.0mm)
• Millimeter markings on focuser drawtube: No
• Rotatable: No