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[OM] Fwd: Lens testing--hocus pocus or are you really in focus?

Subject: [OM] Fwd: Lens testing--hocus pocus or are you really in focus?
From: usher99@xxxxxxx
Date: Tue, 03 Mar 2009 19:23:21 -0500
Shesh,
Really am fuzzy, time to go home.
Proper Link:


http://www.slrgear.com/articles/focus/focus.htm






This slipped by me. 'Member the harsh criticism of SLRgear.com when 
testing a Nik lens because of their back focusing? They were quite 
defensive and took a beating on many lists. Seems there is some 
advantage to having a stable of optics Ph.D.'s available. Perhaps they 
fixed the methodology. 
 
http://www.slrgear.com/reviews/index.php ;
 
This was one elephant standing in the room that looks to me to be 
nicely addressed. 
Would like to see how some of the eagle eyed list members would fare if 
provided with a proper focusing screen and magnifying eyepiece---just 
for fun. As discussed in a few previous threads the included screens 
are quite crummy for fine MF in DSLR's. 
Am not implying that other focusing techniques are not perfectly 
adequate from a practical perspective, but may not be optimal for 
measuring lens performance. 
 
One other elephant in the room is lens sample variability. Wish they 
would test 5-10 lenses to get some idea of index of dispersion of their 
measurements. As discussed in a few previous threads the included 
screens are quite crummy for fine MF in DSLR's. 
 
It also is getting increasingly difficult to separate the optics alone 
 from the lens/sensor system with some significant manipulations by the 
lens CPU prior to analysis.=2
0They commented upon this when testing the 
G1---they suspect significant pre-processing and are investigating. 
 
A. Frequently Fuzzy Mike 
 

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