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Message: <blockquote data-quote="Kammerdiner" data-source="post: 3385830" data-attributes="member: 75300">The full spectrum occurs at both edges, but in most high-contrast backlit situations half of it will fall within the object itself and mostly not be noticed. The inside edge hides the purple, the outside edge hides the green.CA occurs everywhere, though, and if it's bad enough it will degrade the entire image. I've seen a few that had it real bad. That's why ED glass is desirable: it helps to clean up the entire image not just the edges.Most of my binoculars are top-drawer these days, but in terms of CA even the Sightron 8x32 does well enough for me in most cases. And even though I can see CA in every bino I've ever used I'm evidently not as put off by it as some. Mostly I don't go looking for it either. When it happens it happens.Aberrantly yours,Mark <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>