2.5" flattener with ED glass and variable setting of the respective back focus - depending on the optics and camera used.
The flattener does not change the focal length of the telescope and ensures highly corrected fields up to the edge. It was specially calculated for the Tecnosky models 80 / 90 / 102 / 115 / 130 / 152 (ED-Duplets, OWL, SLD) and can be optimally used here for astrophotography - even with full-format cameras !
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