The Optolong L-eXtreme is an exciting addition to the one-shot color filter selection. This filter is narrowband, with a 7nm FWHM Hydrogen alpha bandpass, and a 7nm FWHM Oxygen-III (doubly ionized oxygen) band. This filter cuts through light pollution and allows imaging of emission nebula, planetary nebula and even allows for imaging galaxies with active star-forming regions.
In this review, I used my experience and data acquired with the L-eXtreme and let you judge the results for yourself. Thank you to Jim Thompson, at Abbey Road Observatory for allowing me to use his data (specifically transmission graph) for this review.
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