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[OM] Finally some good measure of lens variability

Subject: [OM] Finally some good measure of lens variability
From: usher99@xxxxxxx
Date: Tue, 4 Oct 2011 14:01:07 -0400 (EDT)
Wondered for many moons how much QA differs in lens manufacturing. Mike 
Hatem noted significant performance differences in Zuiko 21/2's. Much 
grousing on several Canyon L lenses with many reports of bad apples. 
Whether the QA is bad or just the # sold and who they get sold to 
(pixel peepers) is an open question . The below analysis seems to raise 
as many questions as it answers.
Where is the source of the variability?---cam is clearly one. On repeat 
with a top dog sample---less impressive results---regression to the 
mean? There is clearly even registration distance manufacturing 
tolerances as Zeiss often makes lenses that focus past infinity to 
allow for this. They say if it bothers the customer they will adjust it 
for your cam -no charge.

It does confirm that 10X LV  manual focusing is more precise than 
AF--for a target at least.




http://www.lensrentals.com/blog/2011/10/notes-on-lens-and-camera-variation


No none seems to put a lens on a scanning slit optical bench anymore 
but measure system performance. For fun looked into for a minute the
fully automated Zeiss K8 system:  Base price about 194K euro.
There are a few options which are: Image height measuring option, 
4,100,-; Azimuth measuring option, 4,100,-; Collimator option 150mm f= 
1.2m, 7,800,-; Collimator option 150mm f= 2.25m; "on request". So in 
total  US Dollars, figure about $280K. Hmmm, take a pass.

Wonder what it would show for a similar test, however.

Don't want any bad apples, Mike

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