Optolong L-Ultimate Dual Band 3nm 1.25 Inch FilterOptolong 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,

You can control 2 filter wheels simultaneously from one software

Massive tension ring – keeps even the most expensive accessories absolutely safe

these figures are slightly different from ZWO's own calculations and to be checked in practice

9° Stepper Motor

The interior of the barrel is glare threaded and painted flat black to prevent glare

Bright blue (470 nm) # BAD2458303

at an extremely affordable price

NexStar 6SLT is ready to grow with you as you become a more experienced amateur astronomer

640 × 480 @ 28

Its the latest addition to our fully computerized equatorial mount series

Please note: your focuser will require 20mm of additional inward focusing distance from the normal focus position to compensate for the thickness of the filter wheel

The total telescope kit is perfect for impromptu observing sessions or transporting wherever life’s adventures take you