But you can not use the filter compartment of the Protective T-Ring for this filter, as this requires filters with 50.4mm diameter. Anyway, you can use it to use the 2" SemiApo and another 50.4mm filter at the same time.
To connect 2" accessories onto the OTA we have two different rings:
If you choose the ClickLock clamp please take Item No. #2956220 with SC-thread
it is 4,5mm. Please don´t forget that by refraction filter lay out focus to extra focal about 1/3 of the filter thickness. So a 3,5mm filter will
set it about 1,2mm out. According your question please see following picture:
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