![]() Another had to machine the flange down by about 1/16" to make it fit inside the AT1010 tube. 50 to 100 Price Range Agena Astro Starguider Dual ED 4. Adjustable tension and focus lock thumbscrews. The drawtube glides on 4 precision bearings and a roller shaft. A very smooth focuser that has no problem lifting a binoviewer and heavy eyepieces. One customer reported an ID = 97.5mm and needed new screwsĬ3 - Holes don't line up perfectly, so screws are angled and don't go in all the wayĬ4 - Customers have reported different tube diameters for different year modelsĬ7 - Customers have reported different tube diameters for different year models One customer had no problems inserting the GSO Crayford. Under 50-65, Choice 2: Astromania/BST Planetary Eyepieces 3. Click here to create one >Sold<<< GSO 2' Two Speed Crayford Refractor Focuser with Compression Ring Excellent Plus Condition, no marks in anodizing. However, we don't have enough data to state this conclusively.ĮTM - Most customers did not need an extension tube, although it is still possible that you might need one.Ĭ2 - 3 customers had tubes with ID = 96mm and could use the original screws. ![]() The William Optics Synta Focuser with 96mm Flange can be used instead of the GSO96 focuser listed above, but the 'Focusing Issues' column data may not apply.ĪSOT - Focuser bolts inside adapter Adapter screws on outside the telescope tubeįBIC - Focuser bolts inside collar already on the telescope tubeįBIT - Focuser bolts directly to inside of telescope tubeįocusing Issues (For visual use with a diagonal Extension tubes will be required in most cases for direct camera connections for imaging applications):ĮTD - An extension tube is definitely required for additional back-focus travel (need at least a 2" extension on the Celestron C6R).ĮTL - It is possible that you might need an extension tube for additional back-focus travel. Followers 1 tich Members 1,632 2,324 Location: Near Kettering Northamptonshire Posted AugI have recently brought a Celestron C80ED & Im looking at upgrading the focuser as I dont like the rack & pinion type it comes supplied with even after stripping it down regreasing it. ![]() GSO112 - GSO Crayford Focuser with 112.6mm Adapter GSO96 - GSO Crayford Focuser with 96.6mm Adapter GSO86 - GSO Crayford Focuser with 86.4mm Adapter (Single or Dual Speed) If you are considering a GSO linear bearing focuser, then the drawtube is 30mm shorter. * - 'Focusing Issues' are as measured with a GSO single or standard dual speed focuser with a drawtube travel length of 80mm. Table 1: Telescopes on which some of after-market focusers should fit Brand To make sense of the cryptic abbreviations in the table, see the Key below the tables. Compatibility of GSO Crayford Focusers with Refractor Telescopes
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