Quote Below from a helpful forum member...which may explain why I didn't see an improvement in the conquest 10x40 with 93% transmission vs my 89% legend ultra hd, bc the zeiss have low transmission in the blue-green part of the spectrum
"high trasmission in the blue-violett spectrum seem to do a lot for contrast in low light, and probably also perceived brightness,
Swaro SV:s are good at that, also Zeiss HT and the new Leica HD Plus,
Older Zeiss (and also the bushnells it seems) have a high peak transmission in the yellow spectrum but falls quite steep in the green to blue spectrum"
"high trasmission in the blue-violett spectrum seem to do a lot for contrast in low light, and probably also perceived brightness,
Swaro SV:s are good at that, also Zeiss HT and the new Leica HD Plus,
Older Zeiss (and also the bushnells it seems) have a high peak transmission in the yellow spectrum but falls quite steep in the green to blue spectrum"
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