<There are many things in photography that people sweat and fuss over but which ultimately turn out to be moot most of the time. This is not the right profession for worry-warts: their creativity can simply grind to a miserable halt. There are just too many potential technical pitfalls to obsess over: MLU, 1/FL, aperture for best MTF, center post or not, base fog... etc. etc. Best policy is to experiment, establish your own best practices, and go with what works for you.>
I'm with you on this one Keith...