[Leica] A lens is not a number

[Mike Johnston <michaeljohnston@ameritech.net>]

>>>What is the
difference
between a lens of 9.5 and 9.6?     0.1 you say. Of course ,but what does
it
mean?<<<



Any evaluation which purports to distill the performance of a lens down
to a single grade is worthless. Period. There are too many parameters to
look at, and different parameters will be of varying levels of
importance to different users.

I think the significance of the reported tests is that they provide a
clue that the Cosina lenses are most likely not clearly inferior to
Leica lenses, which is valuable information; but the test numbers fall
more under the heading of a clue as opposed to proof.

- --Mike