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Infinitely adjustable extension sleeve with millimeter scale to fine-tune the optical length between 15 and 20mm in the UFC system

The Universal Filter Changer, UFC: The Baader UFC system is a filter drawer suitable for a wide variety of telescope and camera systems with a sufficiently large connection diameter, which is extremely short but also accommodates filter sizes up to 50x50mm vignetting-free. These properties are a condition to the new, fast optics such. For example, to operate Celestron's EdgeHD telescopes and the new RASA devices, as well as all other Prime-Focus astrographs, with appropriate filters that would have a regular filter wheel shade off too much of the front opening. In addition, Prime-focus optics are inevitably equipped with a very short back focus and require a particularly space-saving filter drawer.

The UFC system can connect almost everything with everything by acquiring the same filter base housing and then simply selecting the necessary front and back plate of the UFC together with the spacer rings as required by the respective chip spacing. For this purpose, Baader offers a set with matching UFC extension sleeves, as well as a 15mm to 20mm infinitely adjustable S70 VariLock extension to keep the distance between the filter and the image plane as short as possible. All components are optimized in order to obtain the greatest possible passage in front of the actual filter drawer and nevertheless to be able to precisely set the appropriate distance between the telescope and the chip. The filter drawer itself sits in each case as close as possible in front of the camera, shading by the filter is minimized.