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Howdy
The Canon mount in back of the lens actually screws off, and there is room inside it to put 2 inch filters in, they just sit inside fairly snugly when it is screwed back onto the lens. As one cant see anything through a Ha filter I point towards a bright star and take some 2 sec exposures on Jpeg setting, adjusting focus till sharp, then reset back to RAW and off I go.
Scott
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