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Blog Articles Medium Format Mirrorless L-Mount DSLR Zeiss Leica Making Sharp Images BW+IR

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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

2020-10-08 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

2020-06-15 Hasselblad XCD 65mm f/2.8 Aperture Series: View Over Alabama Hills Formations, Last Light on High Peaks

2020-02-19 Why I am Dragging my Feet with the Voigtlander 50mm f/2 APO-Lanthar: Possible Issue with Sony A7R IV Lens Mount Flange/Sensor Planarity

2019-02-26 Reader Comment: Panasonic S1R and its L-Mount Lens Choices Including Sigma DG HSM Art Lenses

2018-09-26 The Leica/Panasonic/Sigma Alliance L-Mount Alliance

Blur from Camera or Support

Sharpness loss by camera or support or technique..

1. Blur Caused by System Alignment

How To Get Peak Sharpness With Perfect Focus

Focusing is more complicated than it first appears..

1. Case Study: Major Sharpness Gains via Ideal Focus with Lenses having Peripheral Forward Field Curvature (Pine Creek High Peaks)

Camera and Lens Tolerances

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

1. Mount Flange to Sensor Parallelism

How to Test A Lens

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

1. Ruling Out Camera/Sensor Alignment

Nikon D850

The best becomes better..

1. Testing for a Misaligned Sensor
2. Experience Report: Adjusting Autofocus Accuracy with the Nikon 105/1.4E

Nikon AF-S 70-200mm f/2.8G ED VR II

Nikon’s bread and butter telephoto zoom.

1. Main page

Sony A900

The 24.6 megapixel Sony A900 digital SLR is compared with Canon’ top-of-the-line 21.1MP EOS 1Ds Mark III. A field report including two comparisons with the Canon 1Ds Mark IIII, example images in color and black and white, and the Zeiss ZA 135mm f/1.8 Sonnar. Anti-Shake (SteadyShot) is assessed, as is noise behavior..

1. Lenses

Canon 14mm f/2.8L II

In-depth review of the Canon EF 14mm f/2.8L II including flare, distortion, field curvature, resolution charts, numerous field examples and comparison to the Nikon 14-24mm f/2.8G. The Canon EF 14/2.8L II is a superb lens, but with some peculiarities which may enhance or degrade its appeal for different uses. The review is as much a “user guide” as a review; even if you use this lens it’s well worth your time to read this review..

1. Comparison to Nikon 14-24/2.8 Zoom

Sigma Super Tele Varifocal 120-300mm f/2.8 DG OS HSM S

Sigma’s fast an flexible moderate super telephoto..

1. Symmetry Across the Frame

Canon EF 70-200mm f/2.8L IS II

A review of Canon’s new 70-200mm zoom, along with comparisons to other models and the 200mm f/2L IS. Extensive comparisons at multiple focal lengths..

1. Conclusions

Canon Ultra-wide Zoom Lenses: 17-40 and 16-35

Comparing the Canon 17-40mm f/4L and 16-35mm f/2.L II..

1. Comparison at 24mm with Canon 24mm f/1.4L II

Adapting Other Lenses to Fujifilm GFX

Adapting lenses delivers degraded results in most cases..

1. Adapting Lenses to the GFX: Reader Comments

Hasselblad XCD 65mm f/2.8

Normal lens equivqlent to 53mm..

1. Aperture Series: View Over Alabama Hills Formations, Last Light on High Peaks

Hasselblad XCD 80mm f/1.9

Moderate telephoto..

1. Aperture Series: Alabama Hills Formations, Late Dusk

Optical Performance

Sharpness and rendering..

1. Alignment Woes

35mm f/1.4 Distagon

Strokes of a master..

1. Validating Optical Performance of the ZF.2 35/1.4

Otus 55mm f/1.4 APO-Distagon Rendering Style

Rendering style, bokeh and beauty..

1. Aperture Series: Red Barn (Nikon D800E)
2. Aperture Series: Pine Creek Thunderstorms (Nikon D810)

Otus 85mm f/1.4 APO-Planar Rendering Style

Rendering style, bokeh and 'transparency' without peer..

1. Aperture Series: Pine Creek Thunderstorms (Nikon D810)

Zeiss LensSpire Articles

Articles written for Lenspire.ZEISS.com..

1. Zoom Lens or Prime? 135mm

Tripods and Related

Tripods and items for technical excellence..

1. Camera Plates for Small Cameras

Focus

Focus accuracy and focus shift..

1. Autofocus Accuracy

Lens and Camera Issues

Good stuff and not so good stuff..

1. Lens Mount Damage and Misalignment

Photo Tips

Photography Hints and Tips..

1. Infinity Focus Requires Care!
2. How to Carry Large and Heavy Lenses

Canon EOS R

Canon’s first full-frame mirrorless..

1. Introduction to Canon EOS R

Sony Alpha A7R IV

4th Generation standard-setting camera..

1. Shootout of Sony A7R IV vs Sony A7R III: Pine Creek Mining Buildings

Sony Alpha A7R Shutter Vibration

Vibration from the shutter highly damaging to image sharpness..

1. A7R Shutter Vibration, Reader Comments

Lens adapters, tripod mounting, alternative lenses via lens adapter.

Shutter vibration (or not)..

1. Lens Adapters, Lens Mount, ASTAT Lens Tripod Foot

Sony FE 20mm f/1.8 G

Compact ultra-wide angle lens..

1. Aperture Series: View Towards Big Pine and Eastern Sierra, Dusk

Sony FE 35mm f/1.4 GM

High performance mild wide-angle..

1. Shootout vs Voigtlander FE 35/2 APO-Lanthar: Pine Creek Cliffs

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical

High-grade manual focus wide-normal lens..

1. Shootout vs Sony FE 35/1.4 GM, Sigma FE 35/2 DG DN: Pine Creek Cliffs

Sony FE 12-24mm f/2.8 GM

Fast extreme wide angle zoom..

1. Aperture Series @ 17mm: Big Tree at Bend in Alpine Creek

Sony FE 24-70mm f/2.8 GM

Premiere mid-range zoom for Sony full frame mirrorless.

1. Ergonomics

ALLVIEW—Any Lens Live View Camera

Eliminating the camera body barrier— any kind of lens with Live View EVF and LCD.

1. Using a Small Camera with a Heavy Lens on a Tripod

Sony NEX-7 and NEX-5N

24 or 16 megapixels in a compact body with APS-C sensor..

1. Avoiding Subtle Damage to the NEX Lens Mount

Zeiss Batis 25mm f/2 Distagon

Autofocus wide angle for Sony full-frame mirrorless..

1. Aperture Series: Creek Overview (Sony A7R)

Sigma sd Quattro H

Mirrorless Sigma Quattro larger APS-H sensor with interchangeable lenses..

1. Overview of Sigma sd Quattro H

Lens Quality control

How good is Leica quality control?.

1. QC: Camera Implications

ALLVIEW— Any Lens Live View Camera

ARCHIVAL MATERIAL. Eliminating the camera body barrier— any kind of lens with Live View EVF and LCD, and especially Leica M-mount.
HISTORICAL, please see Guide to Mirrorless..

1. Using a Small Camera with a Heavy Lens on a Tripod

Blog posts, reverse chronological

2020

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

2020-10-08 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

2020-06-15 Hasselblad XCD 65mm f/2.8 Aperture Series: View Over Alabama Hills Formations, Last Light on High Peaks

2020-02-19 Why I am Dragging my Feet with the Voigtlander 50mm f/2 APO-Lanthar: Possible Issue with Sony A7R IV Lens Mount Flange/Sensor Planarity

2019

2019-02-26 Reader Comment: Panasonic S1R and its L-Mount Lens Choices Including Sigma DG HSM Art Lenses

2018

2018-09-26 The Leica/Panasonic/Sigma Alliance L-Mount Alliance

2018-09-06 Implications of Flange Focal Distance for Adapting Sony Mirrorless Lenses for the Canon Mirrorless RF-Mount and Nikon Mirrorless Z-Mount

2018-09-01 Sigma DG HSM Art Lenses on Sony Mirrorless, and Implications for Nikon Z7 + Nikon FTZ lens Adapter

2018-08-30 Nikon Z7: Optical Design vs the Large-Diameter Z-Mount and Short 16mm Flange Focal Distance

2017

2017-12-18 Update on Nikon D850 Flange Focal Distance

2017-11-29 Nikon D850: Back from Nikon for Checkup on Flange Focal Distance Issue

2017-11-13 Nikon D850: Flange Focal Distance Problem Means that my Zeiss Milvus 18/2.8 reaches End of Its Focusing Range at around 28°F and is Hosed when it goes colder.

2017-11-01 Nikon D850: Flange Focal Distance is WAY Off (2nd Sample)

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

2017-10-17 Nikon D850, Priorities

2017-10-14 Nikon D850 Experience Report: Adjusting Autofocus Accuracy with the Nikon 105mm f/1.4E

2017-10-12 Nikon D850: Mine Also Has a Problematic Flange Focal Distance (way past infinity mark).

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

2016

2016-02-29 Sigma SD Quattro Mirrorless Cameras

2015

2015-07-16 Left/Right Zone of Focus Skew: Not Always the Lens, the Sensor and Lens Mount Might not be Plane-Parallel

2015-07-06 Sony A7R II, Sony A7R III, Sony A7R IV with Zeiss Otus and other Lenses

2013

2013-12-21 Sony A7R vs Sony A7

2013-12-01 Sony A7R: Lens Support and Lens Mount Torque with Adapted Lenses (Sag, Warp Potential, Shutter Vibration)

2013-09-15 Thoughts on a Full-Frame Sony NEX

2013-07-26 Making Sharp Images new page: Flange to Sensor Alignment, Fantasy Land MTF

2013-04-19 A Camera Plate for the Leica M Typ 240

2013-03-09 What Happens if the Sensor is not Exactly Plane Parallel to the Lens Mount? (UPDATE)

2013-03-01 What Happens if the Sensor is not Exactly Plane Parallel to the Lens Mount?

2012

2012-12-12 Nikon 70-200/4: Torque on the Lens Mount vs 70-200/2.8

2012-01-12 Fuji X-Pro1 — Fujinon XF Lenses on X Mount

2012-01-02 Sony NEX-7: Avoid Subtle Damage to the Lens Mount

2010

2010-03-06 Canon EF 200m f/2L IS

2009

2009-10-08 Where is infinity focus?

2009-08-02 Ultra wide angle lenses and sensor/lens-mount alignment

2006

2006-01-29 Nikon D2X lens mount and/or sensor misalignment