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Optolong L2 Dual Combo Filters Review

Optolong's multi-narrowband (MNB) filter is called the L-Synergy.  It has a 7nm wide pass band at O-III and another at S-II.  When paired with their existing L-eXtreme filter and a one-shot colour (OSC) camera, one is able to produce nebula images using the Sulphur-Hydrogen-Oxygen (SHO...