Hi Eric
Sad to see you give up on the astrophotography.
Always enjoyed your pix and they were darn good ones too.
I wont be needing the filter, I shoot raw and doctor afterwards.
For terrestrial I shoot jpeg with a custom white balance and all is good.
Keep it for your next Canon 450 DH. (might well be worth the extra dollars for Hutech to do the mod).
Best wishes and good luck and dont stay away from astrophotography for too long
now.