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Vignetting test method
We test the vignetting at infinity focus and using standard JPEGs (sometimes RAWs for cross-comparison) based on an evenly lit, back-illuminated test target. The displayed peak in the histogram (representing the gray value) is at the 3/4 position (we overexpose by 1-1.3 stops during the procedure). This approach is the same across all tested systems, of course.

So differences between the sites can occur due to

a. a different focus distance

b. a different exposure characteristic

c. a different S curve in the JPEG/RAW

d. a different tool used for the analysis of the test data

Messages In This Thread
Vignetting test method - by Xastoul - 11-24-2011, 03:14 PM
Vignetting test method - by Klaus - 11-24-2011, 04:12 PM

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