Chip writes:
> I'm just learning to evaluate Gary Reese' quality reviews regarding
> resolution and contrast, etc.; but I'm not familar with referring to lenses
> as having lines per mm; Is this another way to look at what Gary is doing
> anyway ?
Think of it this way: A+ is the best that a lens can do. B+ would be agreed
on nearly 900f the time as "poorer image rendering than A+." That doesn't
make B+ bad, just significantly different. C+ would be agreed on maybe 90%
of the time as "poorer image rendering than B+." And so on.
So, the difference between full letter grades is an obvious change in image
quality. Less than 1 grade and there wouldn't be 90% agreement. More like
60 0.000000or a 2/3 grade difference and 30 0.000000or a 1/3 grade difference.
A+ is breathtaking. B+ is good enough for most of what we all shoot.
Exceptions for me to satisfactorily using anything better than a B+ would be
huge enlargements of landscapes and microfilming.
Gary Reese
Las Vegas, NV
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