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ZWO also make an M48 filter drawer that takes 2" filters.
Just be wary if you order extra drawers - they changed the design of the drawers and drawer holders - where they used to have 2 drawers (one M54, one M48) they now have one drawer that fits both holders.
The new drawers are not compatible with the old holders. I found this out the hard way. Thankfully BinTel were able to provide me with an old drawer.
Also, aren't filters supposed to go as close to the camera as possible? I'm wondering if the star halo you're seeing is light passing through the filter then bouncing off the sensor's glass cover onto the back of the filter and then into the sensor...
Cheers,
V
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