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The RASA 8 Filter Holder allows the use of 2" filters on Celestron's RASA 8" telescope with a camera using M54 threads and having a 17.5mm backfocus such as the ZWO ASI2600 Duo.
To use the RASA 8 Filter Holder, remove the optical window that comes installed in the RASA 8 and install a standard 2" mounted filter in the Filter Holder. The Holder then replaces the standard camera adapter flange from the RASA and is held in place using the stock lock ring. The Filter Holder includes slots so you can still access the collimation screws on the RASA.