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Message: <blockquote data-quote="Matt_RTH" data-source="post: 1355774" data-attributes="member: 53715">Kevin, I also considered digiscoping but I wanted to do it very informally, although I think digiscoping would be help.  As I look at it I agree that it's not something to obsess about.  I did do it as a way to observe directly rather as I have done the reading in the past but I usually try to balance my reading with some degree of observation.  I'll leave the mathematics to the physicists but I do know what I see for the most part, although this test has also taught me something about optical illusion.BTW, the test I did was a variation of a proven back/front focus technique used with digital cameras. DOF and acute focus accuracy are incredibly important with 1.6x crop factors of modern dSLRs.  Again, it's to be familiar with the limits of my gear, although in the case of photography, now that I'm using Canon, problem solved.</blockquote>