Sharpness issues related to camera and lens tolerances and build quality..
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See also 3 pages at macperformanceguide.com
2018-01-11 Apple Quality Control: Enough is Enough
How to verify a good sample and assess all aspects of lens performance..
Illuminating examples of lens behavior..
Premium fast normal lens for L-Mount..
Fast apochromatic prime lens for L-Mount cameras..
Tamron’s ultra wide to medium fast zoom..
Mid-range optimized groundbreaking f/2 zoom..
Sigma’s fast and affordable moderate excellent wide angle..
Ultra wide angle equivalent to 19mm f/3.3. .
Mid-range zoom lens equivalent to 26-53mm f/3.3..
Ultra high speed telephoto equivalent to 90mm f/1.6..
High performance macro photography on medium format, equivalent to 99mm f/3.3..
Fast and gorgeous moderate wide angle Zeiss design..
Fast high performance normal lens of Zeiss design..
Native-mount macro length designed by Zeiss..
Native-mount ultra wide angle high performance zoom for mirrorless..
Ultra high speed native-mount moderate wide angle..
Extreme wide angle zoom..
Ultra wide angle lens adapted from DSLR, native E-mount, all manual..
Native Micro Four Thirds macro lens..
A macro lens with high performance..
How good is Leica quality control?.
The world’s best 50mm lens is outstanding, but with some limits..
Blog posts, reverse chronological
2013-09-06 Samyang 14mm f/2.8: Lens Skew Asymmetry
2013-08-12 Lens Skew with the Leica 50mm f/2 APO ASPH?
2013-02-22 Lens Skew Study added to MSI
2013-02-20 Sigma 35mm f/1.4 DG HSM: Lens Skew
2009-12-10 Nikon 70-200/2.8G VR II bad sample
2009-10-05 Canon EF 100/2.8L IS macro lens bad sample