I am a long time photographer and decided to finally take the deep dive into deep space astrophotography. I am using a Canon 5D mk IV and various telephoto lenses to capture a few images. However I understand after watching endless amount of Astrobackyard and Peter Zelinka that a LP filter is necessary. So far all I can find are 2" or 1" filters for telescopes and the clip in for various cameras, however unfortunately it seems the new generation Canons are not compatible. So i was wondering if there are any good light pollution filters out there for the traditional method of screwing on at the end of the lens. I found a few but they seem to have poor reviews or there is no significant difference. Thank you for your help!