Astrodevice's 2" Filter Adapter # RSF-R8 is designed to connect ZWO ASI cameras equipped with a tilt plate and the Celestron RASA 8 telescope.
Single filter adapter to connect the following cameras to the Celestron RASA 8 telescope:
- ZWO ASI 2400 MC Pro
- ZWO ASI 2600 MM/MC Pro
- ZWO ASI 6200 MM/MC Pro
For those who don’t need the complex functionality of filter drawers, Astrodevice designed an adapter that allows you to place a single filter and work with the Celstron RASA 8 telescope. The device provides the required backfocus of 28.70 mm.
Using the included screws, the adapter is screwed to the front face of the black tilt plate mounted on the ZWO camera. The device has its own tilt adjustment mechanism and it’s equipped with a front-mounted thread for a 2″ filter.
The adapter is screwed onto the telescope using the M87 metal nut, which is a standard part of the telescope’s equipment. The outer diameter of the adapter is 85 mm.
The adapter will be especially useful for those photographing with a single filter and a color camera. Also, those who decide to take long photography sessions and do not need to bother with frequent filter changes, may find that instead of a drawer it is enough to use the adapter. Although structurally less complex, it is nevertheless a very clever solution, cleverly addressing the exacting demands of shooting with RASA and large-sensor cameras.
As you can guess, it is not a just a connector, but a carefully thought-out device. It carries quite unique features. They all come from the fact that the adapter is not simply screwed into the center thread of the camera, but screwed with screws to the outer plane of the tilt plate. Such a procedure allows four advantages:
- The central threaded connector must have a certain wall thickness. When it is screwed into the M42 hole, the light of this hole is significantly reduced, obscuring the corners of the sensor, especially when the cone of light enters the camera at very sharp angles as is the case with the RASA 8. However, the solution proposed by Astrodevice is free of this drawback and the opening through which the light enters is as wide as possible.
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The widely spaced 6 screws allow the adapter to be screwed on solidly, thus achieving a uniform distribution of gravity and pressure. Not only do we get a perfect differential of the connection, but also resistance to the deformation of the geometry under the influence of the camera dropping under its weight.
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Such a solution makes it possible to introduce additional screws for tilt adjustment, mounted directly in the adapter. Thanks to them you can make sensor tilt adjustment without removing the adapter and the camera and without disturbing the settings of the original tilt plate. So if you use the camera for several telescopes, you can set the tilt on the original plate, put the adapter on and modify the correction specifically for RASA. This feature is called Front Tilting Mechanism.
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This mounting method makes it easy to put on a possible additional spacer. If you are struggling to get a non-standard backfocus on your telescope, all you need to do is insert a thin shim between the adapter and the tilt plate. This way you can easily offset the sensor additionally by a few tenths of a millimeter.
The base of the product are 3D printed elements made of PET-G CF filament (polyethylene terephthalate glycol-modified reinforced with carbon fiber).