OPTOLONG L-ULTIMATE FILTER Size:1.25" #0 Photographic Mode: this is

#0 Photographic Mode: this is the standard mode for general astrophotography

2 x timing belts

An inner belt allows you to secure the tube within the bag

If you use a field flattener or a coma corrector that requires a specific distance to the sensor

in terms of lightness and transportability

OPTOLONG L-ULTIMATE FILTER Size:1.25" #0 Photographic Mode: this isThe new Optolong L Ultimate is a dual band astrophotography filter designed to drastically reduce the effect of light pollution. Its two ultra narrow 3nm passing bands isolate the nebulae emissions in H Alpha (red) and OIII (green blue), maximizing signal and making the sky background dark. The L Ultimate filter has been optimized for excellent halo performance. The L Ultimate is designed for use with optics not faster than f 4. For example, with a