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Review Summary
Dovetail ring, S70 (Eyepiece/-Camera-Sided)
3mm (0.12")
Inner: 44.8mm (1.76") (Clear Aperture)
Outer: 75mm (2.95")
Important note on Hyperstar-Adaptation
The distances for adapting a camera to the Hyperstar system must be done with a precision of +/-0.3mm or better, otherwise the image quality will suffer. Please take a look at the following image showing the necessary Backfocus.
Example: A Celestron C11 has got a backfocus of 59.7mm; in addition, the focus shifts 0.66 in the extrafocal direction, if you use filters with a thickness of 2mm (as they are usually used for 2"/M48-housings). As a rule of thumb, a filter moves the focus in the extrafocal direction for 1/3 of the filters thickness. Substract the flange focal distance of the camera from this value (runded 60.7mm). The remaining distance is adjusted by the UCF and its adapters.