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Sigma 105mm F1.4 Art
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07-08-2018, 04:00 AM
skysurfer
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Join Date: Dec 2011
Location: 52N 6E (EU)
Posts: 1,152
105mm / 1.4 = 75mm aperture.
You can test it by flashlight test by shining through the viewfinder's eyepiece and measure the image circle coming from the lens (i.e. the reverse direction of the 'normal' light path).
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