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Message: <blockquote data-quote="Pretzel" data-source="post: 302926" data-attributes="member: 12257">Blah, apology shamology...  you're asking questions and getting answers, no big.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />As for testing the focus, I'd think getting a nice strong pattern on a card, and being able to verify that it's level and placed on a table next to a ruler would work "somewhat similarly" to one of the regex charts.  Redneck engineering, maybe, but it gives ya something to work with without dropping the coin one of the charts.  OR... if ya have a friendly local shop, a lot of them already have set-ups to check that stuff, and perhaps they'd let ya test/diagnose with their charts for 5 or 10 bucks?</blockquote>