i have one..but its not on any of these...
it was lenses from my original 4 fin...
a pic showing both lenses with units turned off...i kinda hand picked lenses...left one is the clearest...the second clearest is being upgraded now...right amp is my spare ....
the lenses i am not using are considerably darker....
the first three are very close in clarity...
but i now have spares and spare meters...