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Message: <blockquote data-quote="jaymoynihan" data-source="post: 1742532" data-attributes="member: 50493">Re astro, for some it is. I am very sensitive to CA. But practically speaking it does not play near the role it does for daytime viewing. A few years back, i tried (for astro) some 15x70mm binos. Ended up getting a pair of Nikon SE 12x50's (despite their high CA). I got them for astro due to their resolution and flat field.Many of the 15-16x70 range (if not all, with exception of the Fuji's) have small sweet spots, with flat field problems, coma etc. At least when i was trying them.By the way, Lawrence Kilham, a rather well known amateur, published bird study guy, used large bino's rather than a spotter. But as he writes in "On Watching Birds", optics are a very personal varied choice. His equipment in his order of importance:Notebook & pencilFolding field chair8x40 binos11x80 binos & tripod (for distance)<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>