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See also: digital sensor, focus skew, lens mount, quality control
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Camera and Lens Tolerances

Sharpness issues related to camera and lens tolerances and build quality..

How to Test A Lens

How to verify a good sample and assess all aspects of lens performance..

Optical Behavior (Case Studies)

Illuminating examples of lens behavior..

Nikon NIKKOR Z 14-30mm f/4 S

Ultra wide compact zoom for Nikon Z cameras..

Sony FE 20mm f/1.8 G

Compact ultra-wide angle lens..

Sigma 14-24mm f/2.8 DG DN Art

Native-mount ultra wide angle high performance zoom for mirrorless..

Sigma 24-70mm f/2.8 DG DN Art

Native-mount ultra wide angle high performance zoom for mirrorless..

Sigma 45mm f/2.8 DG DN Contemporary

Compact native-mount normal lens..

Sony FE 12-24mm f/4 G

Extreme wide angle zoom..

Sony FE 12-24mm f/2.8 GM

Fast extreme wide angle zoom..

Sony FE 16-35mm f/2.8 GM

Pro-grade f/2.8 wide angle zoom..

Leica 50mm f/2 APO-Summicron-M ASPH

The world’s best 50mm lens is outstanding, but with some limits..


Blog posts, reverse chronological

2020

2020-10-18 Swing and Tilt: Subject Distance vs Lens Focusing Offset

2020-10-18 Looks for Mirex Adapter for Nikon F or Canon EF to Sony E-Mount

2020-10-18 Analyzing Swing and Tilt of Sony A7R IV with Two Samples of Sony FE 12-24mm f/2.8 GM

2020-10-16 Update on Sony A7R IV Lens Mount / Sensor Parallelism, Lens Skew of Sony FE 12-24mm f/2.8 GM, Coming Field Shooting

2020-10-12 Lens Mount / Sensor Parallelism Inaccuracies Afflict All Brands

2020-10-08 Is It Even POSSIBLE to get a properly aligned Sony A7R IV?

2020-10-07 Sony A7R IV in for Repair of Lens Mount / Sensor Parallelism Problem

2020-10-01 Sony FE 12-24mm f/2.8 GM Aperture Series: Big Tree at Bend in Alpine Creek (jaw-dropping focus shift and lens skew)

2019

2019-09-05 Fujifilm GF Lens Quality Control = Unacceptable

2017

2017-08-19 Sony 12-24mm f/4 G @ 12mm: Single Frame Performance at f/11 vs Focus Stacking at f/11 (Pine at Morgan Lake)

2015

2015-04-04 Tamron SP 15-30mm f/2.8 Di VC USD: Focusing Problems and Lens Skew

2013

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 Confirmation (Alternate Scene)

2013-02-20 Sigma 35mm f/1.4 DG HSM: Lens Skew

OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ No more slow and noisy hard drives!

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