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Vignetting with Ultra Wides 

The two test shots are with a EF-S 10-22mm on a 20D at 10mm and wide open at f3.5.

Case Values Picture
No Filter

Centre=

200, 201, 199

Lower Right Corner=

158, 164, 176

 

Hoya SHMC Pro 1 UV(0)

 

Centre=

199, 199, 197

Lower Right Corner=

159, 165, 176

 

Filter-No Filter

The reference case without filter has an average luminance variation from centre to the lower left corner of 200 to 166, or as a ratio 1.2048. Most of this is probably due to uneven illumination rather than the lens.

For the with filter case it has an average luminance variation from centre to the lower left corner of 198.3333 to 166.6667, or as a ratio 1.1900.

So with filter has slightly less vignetting, from this we can conclude the filter adds no significant vignetting relative to the test measurement accuracy.

 

Last Updated 05/06/2008

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