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The New filter Drawer for EOS Lens，26.5mm thickness is independently designed by ZWO and specifically made to match with ASI cooled cameras and EOS lens. You can freely use the 2” mounted filter with it.
1. It’s compatible with all ASI cameras with 17.5mm back focus length (except ASI GT series).
2. It’s compatible with all ZWO 2” filters, including the duo-band filter, narrowband filter, IR-cut filter, etc.