Sharpness issues related to camera and lens tolerances and build quality..
Newest blog posts
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..
Does high price guarantee quality control and superb images?.
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..
Standard normal lens equivalent to 52mm f/2.3..
How does Hasselblad’s 3rd generation medium format entry measure up?.
Blurry lenses right out of the box..
Fast and gorgeous moderate wide angle Zeiss design..
Fast high performance normal lens of Zeiss design..
Native-mount ultra wide angle high performance zoom for mirrorless..
Compact native-mount normal lens..
Fast high performance manual focus wide angle..
Extreme wide angle zoom..
Pro-grade f/2.8 wide angle zoom..
A macro lens with high performance..
Outstanding ultra wide angle performer..
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