€314.88
Baader CMOS H-alpha f/3 2" x 2mm ultra high speed filter - premium grade - with 2" screw thread (M48)
3.5nm FWHM (to harmonize shutter speed with O-III/S-II), recommended for fast f/3.4 to f/2.3 optics
Especially...
English GB
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 – Optimized CMOS&media=https://haxon.es/12877-large_default/ultra-high-speed-h-alpha-filter-36mm-f3-35nm-optimized-cmos.jpg){kind=link}