ClaudeM

Despite what the manual says, Starizona specifically says to leave the clear screw-in optical window on the RASA 8. Assuming you are using a ZWO cooled camera with 6.5mm of backfocus when the black T2 adapter has been removed, they say "The optical window in the RASA 8 will stay in place. The Filter Slider accounts for the extra optical path length of the filter glass." From https://starizona.com/products/starizona-filter-slider-rasa-8-zwo-cooled