مرشح هيدروجين-ألفا (H-Alpha) للسماء الليلية من Lumicon مقاس 2 بوصة - LF3090

That faint red glow from Orion's nebula popped right out in my subs last week, and the 2" size fit my astrocam adapter without any spacers needed. It's strictly for deep sky work, so I keep it labeled to avoid any mix-up with solar viewing, and the narrow band really killed the city light pollution.

Finally got a clear night to test this on the Orion Nebula and the contrast on the hydrogen-alpha emission lines is incredible, really bringing out the faint dust lanes. It threaded smoothly into my focuser and feels solidly built.

Swapped out my old broadband filter for this one and the difference in contrast on the Orion Nebula was immediately obvious in my first 10-minute sub. The narrow 12nm bandpass really cuts through light pollution to bring out those faint hydrogen clouds.