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See also: focus skew, lens mount / sensor parallelism, quality control
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Schneider Kreuznach LS 80mm f/2.8

Compact normal 54mm equivalent for Phase One XF system.

Schneider Kreuznach LS 150mm f/2.8 IF

Medium telephoto 100mm equivalent for Phase One XF system.

Schneider Kreuznach LS 240mm f/4.5 IF

Long telephoto 162mm equivalent for Phase One XF system.

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 45-100mm f/4 R LM OIS WR

Slightly long zoom lens equivalent to 37-82mm f/3.3..

Fujifilm GF 63mm f/2.8 R WR

Standard normal lens equivalent to 52mm f/2.3..

Hasselblad XCD 35-75mm f3.5-4.5

Normal lens equivqlent to 53mm..

Hasselblad XCD 65mm f/2.8

Normal lens equivqlent to 53mm..

Hasselblad XCD 80mm f/1.9

Moderate telephoto..

Hasselblad H4D 50 Megapixel Medium Format DSLR

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

Leica S Examples

Examples and comparison from the various lenses.

Nikon NIKKOR Z 14-30mm f/4 S

Ultra wide compact zoom for Nikon Z cameras..

Nikon NIKKOR Z 85mm f/1.8 S

Fast portrait telephoto for Nikon Z..

Sony FE 20mm f/1.8 G

Compact ultra-wide angle lens..

Sony FE 35mm f/1.4 Distagon ZA

Fast and gorgeous moderate wide angle Zeiss design..

Sony Planar T* FE 50mm f/1.4 ZA

Fast high performance normal lens of Zeiss design..

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..

Voigtlander FE 21mm f/1.4 Aspherical

Fast high performance manual focus wide angle..

Sony FE 12-24mm f/2.8 GM

Fast extreme wide angle zoom..

Sony FE 12-24mm f/4 G

Extreme wide angle zoom..

Sony FE 16-35mm f/2.8 GM

Pro-grade f/2.8 wide angle zoom..

Zeiss Loxia 21mm f/2.8 Distagon

Outstanding ultra wide angle performer..

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

2020-10-23 Compared @ 14mm: Swing and Tilt, Optical Decentering — two Sony FE 12-24mm f/2.8 GM and Sigma FE 14-24mm f/2.8 DG DN Art

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

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

2020-10-01 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

2019-12-01 Phase One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 Aperture Series @ 80mm: Mosaic

2019-12-01 Phase One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 Aperture Series @ 55mm: Mosaic

2019-12-01 Phase One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 Aperture Series @ 40mm: Mosaic

2019-11-30 Phase One IQ4 + Schneider Kreuznach LS 240mm f/4.5 IF Aperture Series: Mosaic

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)

2017-07-23 Sony 12-24mm f/4G Distortion: Uncorrected vs Corrected

2017-07-23 Reader Comment: Sony FE 12-24mm f/4 G Right Side Blur

2015

2015-07-20 Sigma 24mm f/1.4 DG HSM Art Aperture Series: Bristlecone on Bare Hill, Checking for Lens Symmetry (Canon 5DS R)

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

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