Visual alignment? Sheesh!
Very interesting and not surprising. Sadly.
Puts is a member of the "old school" that mandates integrity and
precision in testing.
I hate to ask but I will -- is he and employee of or direct consultant
to Leica? He has his own Website, but Leica published his guide to
their lenses, so . . .
ScottGee1
On 11/24/06, Winsor Crosby <wincros@xxxxxxxxxxx> wrote:
> I ran across this in the MTF article on Erwin Puts' site:
>
> "Then I check for decentring on the optical bench. As a side line I
> may note the much acclaimed tests from Color Foto magazine (those
> famous two million data!) are critically wrong on the decentring
> issue. In one of their latest issues, they noted a decentring of
> about 8% for several high-grade lenses. This cannot be true! I
> happened to be present when the lab that does the tests for CF, did
> some tests: they put a camera in front of the testchart on a tripod
> and manually/visibly align the camera for the test chart: a
> notoriously difficult procedure and when using test data that are
> measured by computer, the results do not tell you anything about
> optical decentring, but only about the skill of the operator to align
> the camera."
>
> http://www.imx.nl/
>
> I was interested because it confirms my suspicion when some tester is
> questioned about a result that is at variance with other other tests
> and says it is sample variation, or someone passes off their bad
> technique as getting a bad edition of the lens.
>
>
> Winsor
> Long Beach, California, USA
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