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Message: <blockquote data-quote="henry link" data-source="post: 3178575" data-attributes="member: 6806">Steve,Here's a link to some photos of the CA target I use. <a href="http://www.birdforum.net/showpost.php?p=3014161&postcount=4" target="_blank">http://www.birdforum.net/showpost.php?p=3014161&postcount=4</a>The one on the right has some particularly vivid lateral color. Try looking at the computer screen from about 6' with the brightness cranked up. That's about what a daylight view of the target would look like through the binocular eyepiece. Can you see the red and green colors? They're not an optical illusion. They're just as "real" as if colored strings had been draped over the target. The point of constructing a target like this, which is just about guaranteed to make CA visible, is not to torture myself with unwanted knowledge, but to allow controlled comparisons between different binoculars, like the more or less average specimen on the left and the poor performer on the right. I've been using this thing for years and I think rather than making me a CA nit-picker it has actually inoculated me against the craziness that comes from unreasonable expectations about CA in binoculars.Henry</blockquote>