The flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. The flattener, also called a field flattener, corrects this effect. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera.
An essential feature of the corrector is the integrated fine adjustment. By turning the knurled ring on the corrector, you can adjust the distance to the sensor to fractions of a millimetre. Once you have reached the desired distance, fix it with the clamping screw. This allows you to determine the optimum distance with the camera connected by taking test shots without additional adaptors and adjustment rings. The camera does not rotate during fine adjustment.
The following settings from the innermost position of the adjustment to the sensor are recommended:
- Aperture 102 mm / aperture ratio f/7: 69.87 mm
- Opening 107 mm / aperture ratio f/6.5: 69.0 mm
- Aperture 130 mm / aperture ratio f/7: 66.17 mm
- Opening 140 mm / aperture ratio f/6.5: 65.8 mm
- Opening 150 mm / aperture ratio f/8: 63.34 mm
- Aperture 155 mm / Aperture ratio f/8: 62.57 mm
Suitable for: Refractor telescopes from 102 mm to 155 mm aperture with focusers from 2.5" clear passage.
TS Optics is a brand of Teleskop-Service.
