d6f7415d_200G_and_needed_modifications___What_it_s_good_for_
[Feature] Coupling [ECP] Air [Ampro] Liquid [What it's good for.] 
With LC there are no reflections from the lens to the tubeface that means that a bright spot doesn't leak onto the black surroundings.
The Ampro Esprit 4200G and needed modifications.
What it's good for.