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<blockquote data-quote="WayneF" data-source="post: 363396" data-attributes="member: 12496">You probably should do some careful validation before you do too much&nbsp; computational work.&nbsp; Assuming the DOF formula is accurate at macro distances is&nbsp; suspect.&nbsp; For one thing, as the lens is racked far out for close focus,&nbsp; the focal nodes (design points in the lens) shift substantially.&nbsp; This&nbsp; doesn't much matter at landscape distances, but becomes a significant factor at&nbsp; macro. And, just assuming the DOF formula's assumed criteria is same as your criteria is also suspect.I still think the viewfinder and rear LCD are the best tools.&nbsp; Look at the view you get, and the results you get, and then simply do what you need to do to get what you want.&nbsp; This may involve a little skill to know what to do, but experience is the best teacher.&nbsp; Keeping everything in the one focal plane is a biggie.&nbsp; One three inch dragon fly is surely much like the previous one.&nbsp;&nbsp; We can see what happens.&nbsp; We just need main ideas - we don't need to know the hairy physics (theory and practice can be different in practice <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; ).&nbsp; Mostly, we just have to realize that trying a few things can help substantially.&nbsp; It really is not rocket science.</blockquote>

[QUOTE="WayneF, post: 363396, member: 12496"] You probably should do some careful validation before you do too much computational work. Assuming the DOF formula is accurate at macro distances is suspect. For one thing, as the lens is racked far out for close focus, the focal nodes (design points in the lens) shift substantially. This doesn't much matter at landscape distances, but becomes a significant factor at macro. And, just assuming the DOF formula's assumed criteria is same as your criteria is also suspect. I still think the viewfinder and rear LCD are the best tools. Look at the view you get, and the results you get, and then simply do what you need to do to get what you want. This may involve a little skill to know what to do, but experience is the best teacher. Keeping everything in the one focal plane is a biggie. One three inch dragon fly is surely much like the previous one. We can see what happens. We just need main ideas - we don't need to know the hairy physics (theory and practice can be different in practice :) ). Mostly, we just have to realize that trying a few things can help substantially. It really is not rocket science. [/QUOTE]

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