Some CN'ers (not in this thread) keep posting that the L-eXtreme "let's more [OIII] through than the L-eNhance." In my brief experience, the opposite is true - narrower bandwidth (7nm for L-eXtreme vs 24nm for L-eNhance) constricts the amount of [OIII] and Ha that gets to your camera's sensor.
Note the increased amount of blues, including stars, in the L-eNhance in Jim T's attachment. The cost is there is less contrast in the L-eNhance because the amount of spurious light washes out the image. The restricted bandwidth of the L-eXtreme reduces the background stars, and some nebulosity if not enough data is captured, and gives the visual effect that the photons that do get through the filter have higher contrast. Light is a spectrum not a bunch of spikes.
IMHO, if you have extreme LP and/or want to sacrifice some delicate nebulosity for increased, specific structure detail, then L-eXtreme is your choice. If you have moderate LP and/or want a slightly broader spectrum of nebulosity, then get the L-eNhance.
Like most things astronomical/AP it's not "X is better than Y", these are just tools that each have their purpose. There may be some overlap.
Also from a business perspective, why would Optolong release one product that makes their other very popular product obsolete? Doesn't make smart business sense.
Thank's to you Jim for the excellent write-up.
CS & GB!
Edited by SoDaKAstroNut, 01 September 2020 - 12:41 PM.