![]() ![]() ![]() We cannot advise you of this before purchase, as it will work for the vast majority of telescopes. Please note: A very small number of older Celestron SCTs had a non-standard SCT thread (with a different thread pitch), so this adapter may not screw on. Total length = 48mm (1.89"), Depth of eyepiece holder inside = 40mm (1.57") Weight = 3.5 oz., Made in Taiwan. The inside surface of this adapter is black-matted to enhance contrast by reducing stray light reflections. Because the set-screw does not come in direct contact with the eyepiece, the eyepiece barrel will not be scratched or dented. It includes a brass compression ring that clamps around the inserted eyepiece or accessory. ![]() The practical adapter is made from precision machined aluminum and is black anodized. Shipping: Hubble Optics 5-Star Artificial Star for Testing and Collimating Telescopes 28.65 Sky-Watcher Field Flattener for EvoGuide 50ED S20214 95.40 Baader Ultrashort 1.25'/T-2 Clamp 2458121 40.30 Baader Vixen M43 Male to T2 Male Adapter T2-22 1508037 39.25 ZWO EAF Bracket for Takahashi and Some Other Telescopes 30. If you already have a standard 2" diagonal for your refractor telescope, you won't need a new SCT-type diagonal for your telescope! However, note that this adapter will not accept an SCT-threaded diagonal. Using this adapter, you can attach 2" diagonals, photo adapters or other accessories to your SCT telescope. The standard SCT rear cell thread on telescopes is a 2" diameter x 24 TPI male thread. This high-quality adapter connects to the rear cell of many Schmidt-Cassegrain telescopes made by Meade, Celestron and others. The Blue Fireball T2 spacers at AgenaAstro are much more refined by comparison.New, Improved Version - Now with 2 large thumbscrews for a more secure grip for heavy accessories. Sort by: Most Popular Sales Favorites New Price. For your sensor size, the 105mm number from the metal back of the 0.63x reducer, plus or minus a millimeter or two, should be good enough.Īmazon also carries a variety of T2 spacers, but you are limited to pretty much low end, inexpensive stuff from SVBONY and Astromania. Your position: Home / Finder & GuiderScopes / Finder & GuideScopes / 70mm Guidescope. The optics are imperfect, and you often have to custom fine tune the distances to get a completely flat field, although for the sensor size of the ASI290, it should not matter as much compared to a larger sensor. The ZWO documentation should give the camera flange to sensor distance for your particular camera.Īgena also sells T2 metal washers that are 0.25, 0.5 and 1mm thick that you can use to fine tune the back focus. You did not mention the variety of ASI290 - the mini and the hockey-puck versions of the ASI290 have different flange-to-sensor distance. Remember that it is 55mm to the sensor, not to the camera flange, and needs to also be compensated if you add a glass filter between the reducer and the camera. You can find lots of T2 spacers at places like Agena Astro, although ZWO cameras often come with spacers that allow you to achieve this "55mm" too. Discontinued Blue Fireball 1.25' Extension Tube with 2.2' Extension X-02 22.95 Out of Stock Out of Stock Free US Shipping Over 25 Blue Fireball 1.25' Eyepiece Extension Tube with 1' Extension X-01 20.95 In Stock Add to Cart Free US Shipping Over 25 Blue Fireball 1.25' Eyepiece Extension Tube with 1.5' Extension X-10 22. This number (55mm) matches the Tamron T-mount standard. The Celestron T adapter is 2 inches (50mm) long, so the distance from it to the camera sensor is 55mm. The back focus from the metal back for the Celestron reducer is 105mm (metal back to camera sensor). But when you see "M42," be sure to check that they are P0.75 instead of P1.0, or you could be cross threading your devices (like the threads on your camera). T and T2 almost always impliy the correct 0.75mm thread that you need. T2 is sometimes called M42 or simply just "T", but there are two varieties of M42, with 0.75mm pitch (the Tamron T mount standard) and the ones with 1mm pitch (the old Pentax M42 standard). If you are using the Celestron 0.63x reducer, you can adapt it to the T2 (M42P0.75) thread using the Celestron T-adapter-SC.įrom there, you just use T2 adapters to reach the proper back focus to the sensor of the camera. Product Info Reviews Product Info Manufacturer Description New, Improved Version - Now with 2 large thumbscrews for a more secure grip for heavy accessories. RickD_99 I would be using the Celestron F/6.3 reducer/corrector and attaching the 290MC directly to the F/6.3 R/C. ![]()
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