This is the Teleskop-Service RC 0.8x Corrector Reducer for Ritchey Chretien - big sensors - M68 connection.
Focal Reducer and Field Corrector for Ritchey-Chrétien Telescopes:This corrector reducer offers complete correction of the image field of RC telescopes with reduction of the focal length to 80% at the same time. Pure telecompressors will only reduce the focal length without correcting the image field. The result is an aberration (astigmatism) in the corners. The larger the sensor, the more pronounced the aberration.The TS-TSRCRED is designed especially for the image field of f/8 RC telescopes, thus it eliminates the aberrations entirely. The results are sharper, pinpoint stars and easier focusing.This reducer is also the only one for full frame size sensors that can be used on the Teleskop-Service RCs from 1-inch with the large focusers, such as TS-TSFOCR30S.Adapting the TS-TSRCRED to the telescope:There are two ways of adapting to the RC telescope. You can thread the corrector to the focuser or countersink it into the drawtube if you have less than 135 mm working distance.
- Connection at telescope side: M68x1 thread (female).
- Connection at camera side: M68x1 thread (male).
- Diameter 74 mm - the corrector can be sunken into 3-inch focusers.
- Working distance from the male M68x1 thread: 82 mm.
- The focal length is shortened by the factor 0.8x and the speed is increased correspondingly.
- In addition, the corrector eliminates the field aberrations of f/8 RC telescopes, it works with all f/8 RC telescopes, for example TS-Optics, AstroTec, CFF, Officina Stellare, ...
Connection via the female M68x1 thread on the telescope side: Via suitable adapters, you can attach the corrector to any focusers from 2.5-inch and greater. You just have to provide the focuser with a male M68x1 thread at the camera side. Please note: You need at least 135 mm working distance from the male thread.Connection by countersinking the corrector into the drawtube at the same time: If there is less backfocus, the manufacturer recommends countersinking the corrector into the drawtube. Thus the necessary backfocus is reduced to less than 100 mm. Suitable adapters are: For focusers with the female M78x1 thread, like the TS-TSFOCR30S, the suitable adapter is TS-M78a-M68a.Connection for a camera to the TS-TSRCRED: The working distance from the male M68x1 thread at the camera side is 82 mm, thus you have enough space for individual adapters or accessories like off-axis guiders. The male thread is not taken into account for the working distance, as it disappears into the connection adapter.