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    Nikon Monarch HG 10x42 - Visible Line on Prisms & Inconsistent Focuser Feel

    The straight edge formed where two sides of a prism meet could reflect back a strong thin line just like the roof edge and of course that line would be far off center when you're looking straight down the optical axis. Your photos are all made from an off-axis angle with an apparently off-axis...
  2. H

    Nikon Monarch HG 10x42 - Visible Line on Prisms & Inconsistent Focuser Feel

    The Schmidt-Pechan prisms in this binocular can't be cemented, so I think the "scratches" are probably areas where the the thin roof edge is catching the beam of the flashlight at just the right angle to reflect a bright image of the edge back toward the camera. Also nothing to worry about.
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