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This lens achieves only a fair resolution at this magnification using the PN-11 extension tube
Resolution: This lens achieves only a fair centre resolution at f/5.6 using an extension tube to achieve x1 magnification
Chromatic Aberration: High as the lens is stopped down
Vignetting: Very low across aperture range
Macro Sweet Spot: there better choices: use the lens at x 0.5 without an extension tube
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