I recently purhased a new pair of binoculars that have ther Ruby coating and I Love them! they are excellent looking and they perform well. but I was wondering what the advantage is to the Ruby Coating.. my guess would be more light transmission??

From "Bigbinoculars.com" -

"the coating has nothing to do with the mineral ruby. Some manufacturers filter red to compensate for poor-quality optics that do not properly converge the color spectrum. By eliminating red from the spectrum, the optics appear to do a better job of minimizing color abberations- but gives the view through the binocular an unnatural greenish cast. Steer clear of "ruby" coating- it's simply a gimmick with no redeeming qualities. We've seen ads from unscrupulous vendors that claim magical "night vision" properties for their "ruby-coated" binoculars - "no batteries required". Rubbish..."

Sorry!

The ruby color comes from that part of the spectrum that reflects off of the glass. Thereby, it is that part of the spectrum that the Anti-Reflective coatings are NOT doing their job. Really good coatings are perfectly dark, coating mortals can afford are almost perfectly dark on axis.

So what about the ruby coating on my pride & joy aimpoint?

Great, so I mention a quality optic with a ruby coating and everyone shuts up...what the heck?

Quoted: So what about the ruby coating on my pride & joy aimpoint?

Maybe, and I'm just pulling this out of my a$$, the Aimpoint is filtering out the red to provide better contrast to make the red dot more visible against a larger variety of backgrounds, like ones that may contain red?????

I'd buy that.

Quoted: So what about the ruby coating on my pride & joy aimpoint?

thats a great question.. I just picked up a bushnell trophy that has it too. I wish I knew the answer for ya. it was a little heart breaking to hear that it didnt do anything for it.  oh well. now I know. :)

In my personal experience, the coating reduces the effect of color fringing when looking at dark objects against bright backgrounds (or vice versa).  The usual rainbow distortion around sharp edges becomes just a bit of fuzz.