Titoy writes:
<< Can you enlighten me on what you mean by "high SQT grade open?" >>
That is SQF, the letter grades I give in my lens tests, and loosely
based on the Popular Photography methodology. It takes a B- or better to
get an image on the viewfinder screen that one can be sure is in focus.
I've come to predict a C+ or worse by having to hunt for correct focus.
Gary Reese
Las Vegas, NV
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