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Message: <blockquote data-quote="Kevin Purcell" data-source="post: 1469411" data-attributes="member: 68323">I'd have to take it out and have another look to be sure but ...brightness: transmission of a typical small multicoated porro. Not too many elements in the path (it focuses by moving the objectives so they toe in too for closer items). There is an extra loss in the coated plate at the front of the bin. The usual caveats of a small exit pupil but then again as it's primary design seems to be a butterfly bin and they are out at midday that's not an issue.edge distortion: not sharp to the edge IIRC but then again I generally don't look at stuff at the edge of field so I don't know if it's astigmatism or curvature. It's not wildly obvious. I shall check.CA control: pretty ordinary glass and a short f number (I think) so there is both some longitudunal CA and lateral CA in the EP (no special glass there either). It's not fantastic but it's not bad either. Unless you are looking at high contrast objects you don't notice it (but of course it's there and messing with the image).I also recall out of focus there seems to be more spherical abberation in the out of focus background (that circle like effect ... if you know what I mean).I'd say overall the image quality was a little down on the Yosemite. But the unique feature make up for it.</blockquote>