In the seemingly endless selection of Chinese optics, this particular one has 36 different color options for the reticle. Just a gimmick or do people really need that many colors?
Not really sure what an “emerald lens coating” is either.
https://leapers.com/index.php?act=prod_detail&midx=1968&allids=1952_1968&itemno=SCP3-18IEBG4
I know diddly squat about optics but I know enough to know that Chinese + leepers x 36 colors = gimmick
Possibly to detect Predators when they’re camouflaged? 
Hmmmm…
LA Dodger Fan> Select Dodger Blue
Alabama Fan> Select Crimson
Air Force Academy Grad> Select Cadet Blue
Army Vet> Select Olive Drab
Navy Vet> Select Navy
Syracuse Fan> Select Orange
Scottish Ancestry> Select Thistle
Afflicted w/Motion Sickness> Select Pale Green
Texas A&M, Minnesota U., Boston College, Virginia Tech, or Mississippi State Alumni> Select Maroon
Gay Pride Supporter> Select either Crimson, Orange, Yellow, Green, Blue, or Violet
:laugh::laugh::laugh::laugh::laugh: