R-Bessellフィルター

Installed this red photometric filter in my imaging train and immediately noticed how cleanly it cut off unwanted wavelengths. The transmission is noticeably higher than my old filter, which cut my exposure times by almost a third.

I was worried about durability with photometric filters, but this one's held up perfectly after swapping it in and out of the filter wheel dozens of times. The transmission on my test exposures is noticeably cleaner compared to the old generic red filter I was using.

The sputtered coating on this filter is noticeably more durable than the cheaper alternatives I've tried. It cleaned up easily after a dusty session without any scratches.