Agena astro optolong9/16/2023 ![]() It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere, maximizing the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. The 3nm isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue). The L-Ultimate is a 3nm dual band filter designed to drastically reduce the effect of light pollution. While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolongs L-eNhance filter effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of around 90. ![]() ![]() Color Correction & Minus Violet FiltersĪgena Astro affiliate Galactic Hunter created this detailed written review of the Optolong L-Ultimate, plus a video version below:. ![]() Correctors, Focal Reducers & Flatteners Optolong L-Ultimate Review Agena Astro affiliate Galactic Hunter created this detailed written review of the Optolong L-Ultimate, plus a video version. With a focal length of 200mm and a fast f/4 focal ratio, this six-element ED lens lets you capture a wide field with less expensive smaller-sensor astro cameras. ![]()
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