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.
The variably adjustable flattener can be used for various refractors with small apertures.
Our expert comment:
This variable reducer/flattener is ideal for use with the following Tecnosky refractors (ED, Triplet):
SLD 102/714
Triplet 115/800
SLD 130/910
SLD 152/1216
In general, it can also be used successfully on other refractors of similar size with aperture ratios between f/6 and f/8.
The back focus is between 55 mm and 70 mm, depending on the telescope model.
(Jan Ströher)
