My experience with various Leica HD/HD+ models is the same as Jremmons's. I couldn't reliably differentiate between them with visual comparison. When I know which is which, I can convince myself that I see a small difference, but would not dare to make a bet that I could tell them apart without external cues.
Sample differences in aberration levels can, however, cause the image of one binocular to be clearer and purer to enough of a degree that the difference becomes reliably recognisable, and that means more to me than slight transmission differences.
Kimmo
Sample differences in aberration levels can, however, cause the image of one binocular to be clearer and purer to enough of a degree that the difference becomes reliably recognisable, and that means more to me than slight transmission differences.
Kimmo