مرشح B-Bessell

Finally got this mounted in my imaging train last night, and the transmission on those blue wavelengths is noticeably cleaner than my old filter. The build quality is solid too—the coating seems really durable and it threaded on smoothly.

The sputtered coating on this blue filter is noticeably cleaner than my old glass one—no halos around bright stars even at f/5. It threaded right into my filter wheel and the transmission loss was imperceptible in my first luminance-calibrated run. Solid buy for anyone doing serious photometry work.

Installed this filter on my mono camera last night and the difference in blue channel response was immediate. The sputtered coating really does seem to cut down reflections compared to my old generic filter.