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Optolong L-Ultimate 2" Light Pollution Dual Band Filter - $400 (Fountain)
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The Optolong L-Ultimate is Optolong's newest and NARROWEST dualband filter. This is an exceptional choice for amateur astrophotographers who use one shot color (OSC) cameras for deep space imaging. This 3nm dualband filter will cut through the light pollution and provide high contrast data for you to process and enjoy.
The L-Ultimate from Optolong is a 2" threaded light pollution filter. While the L-Ultimate is similar to Optolong's L-eNhance and L-eXtreme filters in that it is a dual band filter that allows the transmission of Oxygen III and Hydrogen Alpha wavelengths, the L-Ultimate differs in that it only allows a 3 nm badwidth at both the H-Alpha and OIII transmission lines. Compare this to the 7 nm of the L-eXtreme.