Optolong 3nm L-Ultimate Filter - 2" Baader Barrel Length: 2"

Barrel Length: 2"

You can also download the Lunar Landscapes eBook by Robert Reeves

Drive system: Microstep electric drive by stepping motor

1 mm x 13

until the image is sharp

Optolong 3nm L-Ultimate Filter - 2" Baader Barrel Length: 2"The Optolong L Ultimate 3nm dual band filter is designed to drastically reduce the effects of light pollution. The 3nm isolates the nebulae's emissions into H Alpha (red) and OIII (green blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. 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