Optolong L-Ultimate Dual Band 3nm 1.25 Inch Filter video One full F-Stop faster than

One full F-Stop faster than f/11: Reduces the exposure time by one-half to capture the same brightness of object

SkyAlign allows you to align on any three bright celestial objects

High Sensitivity

• Visual back allows for use with 1

Optolong L-Ultimate Dual Band 3nm 1.25 Inch Filter video One full F-Stop faster thanOptolong L Ultimate Dual Band 3nm 1. 25 Inch Filter Optolong L Ultimate Dual Band 3nm 1. 25 Inch Filter 3nm is designed to drastically reduce the effect of light pollution. The 3nm bandwidth means it strongly isolates the nebulae's emissions into H Alpha (red) and OIII (green blue) from anything else. It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps,