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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..

Fujifilm GF 23mm f/4 R WR

Ultra wide angle equivalent to 19mm f/3.3. .

Fujifilm GF 32-64mm f/4 R LM WR

Mid-range zoom lens equivalent to 26-53mm f/3.3..

Fujifilm GF 110mm f/2 R WR

Ultra high speed telephoto equivalent to 90mm f/1.6..

Fujifilm GF 120mm f/4 Macro R LM OIS WR

High performance macro photography on medium format, equivalent to 99mm f/3.3..

Hasselblad H4D 50 Megapixel Medium Format DSLR

How does Hasselblad’s 3rd generation medium format entry measure up?.


Blog posts, reverse chronological

2019

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

2019-03-13 Sigma 24-70mm f/2.8 DG HSM Art Aperture Series @ 24mm: Alabama Hills Rainstorm Creek (Nikon D850)

2017

2017-10-28 Nikon D850: the 2nd Sample is Off Also, both Skewed and Bad Flange Focal Distance

2017-10-01 Nikon D850: the Focusing Distance Issues Stem from a Sensor that is not Parallel to the Lens Mount (Nikon quality control issue)

2017-09-29 Nikon D850: Apparent Build Tolerance Error in Flange Focal Distance vs Optical Viewfinder, Causes Major Focus Error with Manual Focus Lenses and Focus Confirmation

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)

2016

2016-05-08 Sony 85mm f/1.4 Scratchy/Noisy Focusing: I Heard None with my Sample

2016-04-09 Sony G Master 85mm f/1.4 Scratchy/Noisy Focus with Internal Wear

2015

2015-08-18 Sony FE 35mm f/1.4 Distagon: Another Bad Sample with Skew / Asymmetry (A7R II)

2015-08-09 Sony 90mm f/2.8: Bad Sample (NOW WITH EXAMPLES)

2015-04-17 Sony FE 35mm f/1.4 Distagon: Quality Control Issues, Right Side Blur at f/1.4

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

2012

2012-11-26 Sigma 35mm f/1.4 DG HSM: Quality Control Steps Up (“A1 MTF”)

2012-01-30 Sony NEX-7 + Sony 24mm f/1.8 Sonnar — “Bad Sample” Documented

2010

2010-07-28 LensRentals.com discount code, and lens brand quality control

2010-07-11 Bad sample experience — Nikon AF-S 24mm f/1.4G

2009

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

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