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hi glen
if you can find a filter draw system or similar that works i'd recommend it over 'clip in'. i had a clip in and i couldn't imagine changing it as often as you would be needing to for nb. super fiddly and difficult put in and take out.
Ha and Oiii will be used most. narrower is considered better but gets expensive. the baader options i think are from memory better value for $. focus will be slightly compromised when you remove the camera, even happens with a filter draw setup.
cheers
russ
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