Trial shooting to evaluate the performance of semi-narrow band filter, utilizing IDAS LPF-P2 and Lumicon H-alpha filters. ———————————————– The cutoff wave length of the Lumicon filter is 635 nm while the cutoff of the infra-red region by LPF-P2 occurs at 685~690 nm. Thus these two filters passes the spectrum of 35nm width. ーーーーーーーーーーーーーーーーーーーーーーーーーーーー IDAS LPF-P2 and Lumicon H-alphaを利用したＨアルファフィルターの性能テスト ーーーーーーーーーーーーーーーーーーーーーーーーーーーー Kit Zoom lens (35-80mm for film EOS REBEL) at 80mm FL Session 1: 20 frames with IDAS LPF-P2 at ISO1600, 60 seconds of EOS REBEL T3 Session 2: 10 frames with Lumicon H-alpha filter and LPF-P2 filter at ISO3200, 180 seconds of EOS REBEL T3 20 darks and 20 flats for each session ————————————- It appears these two filters combined together can filter out the city lights to a certain extent, enhancing the contrast of the image.