anthonysemone
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fellow gear heads  , I'd appreciate your thoughts. While not directly photographically related, CA appears also, and not surprisingly, to be an issue with rifle scopes. I just purchased a high-end rifle scope, part of a new line offered by Bushnell Precision Optics, produced especially for the law-enforcement ERT, HR, as well as for military long-range precision applications. It's the 3.5x21-50 HDMR with G2 reticle.
After having it mounted by my dealer, I promptly took it to a safe location where I mounted the rifle to a bench, and began checking out the scope clarity, resolution, IQ, etc. The day was high overcast and very bright; no shadows, however, snow covered the ground.Target was a tree about 1meter in diameter at about 75 meters from my location. IQ, etc. was superb. Bright clear sight picture. And then I moved to 10x, 14x and 21x. Making certain that parallax was not an issue - it adjusts down to 50 meters, and that I had the eyepiece well-focused for my vision, I saw quite a remarkable production of CA and purple/yellow fringing. I could eliminate all of it if I made sure that my eye was precisely located in the absolute center of the eyepiece, or, what I interpreted to be the centermost point because that's where all of the aberrations disappeared.
So, can the environmental conditions of high, bright overcast sky with a sharply contrasting "target" against an uninterrupted and equally bright, reflective ground cover of snow, together with the optic variables of high magnification produce a worst-case scenario test, artificially enhancing the presentation of chromatic aberrations, purple/yellow fringing? Or, is the scope defective? FWIW, I have sent it off to Bushnell for their evaluation, but I wanted to be prepared for the report after they evaluated it, and I also wanted to be fair to them.
TIA,
tony
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