Sharpness issues related to camera and lens tolerances and build quality..
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Newest blog posts
Pages at other diglloyd sites:
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..
Full frame ultra wide angle zoom..
Tamron’s ultra wide to medium fast zoom..
Mid-range optimized groundbreaking f/2 zoom..
Sigma’s fast high performance wide angle..
Sigma’s fast and affordable moderate excellent wide angle..
Compact normal 54mm equivalent for Phase One XF system.
Medium telephoto 100mm equivalent for Phase One XF system.
Long telephoto 162mm equivalent for Phase One XF system.
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..
A variety of 645 lens tests on the 645D.
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..
Pro-grade f/2.8 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