مرشح بايدر بلانيتاريوم 1.25 بوصة للأشعة تحت الحمراء (685 نانومتر) - FIRP-1

The sharpness difference on Jupiter was immediately obvious after screwing this filter in—it cuts through urban skyglow and really firms up the planetary detail. Even with my 6-inch scope, the contrast boost on Mars was noticeable without washing out the fainter surface features.

I’ve been using this filter on my 8-inch SCT for lunar observation, and the sharpness improvement on the terminator is immediately obvious compared to no filter. The 685nm cutoff really cleans up atmospheric blurring on nights with average seeing.

The IR filter sharpened my lunar images noticeably, and it threaded onto my eyepiece without any cross-threading issues. The contrast improvement was subtle but real, especially on high-power targets.