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Ray Angle, Vignetting, Color Shading on a Digital Sensor

Evenness of illumination, color shading, digital sensor effects, ray angle..

Astigmatism

Understanding astigmatism..

Adapting Other Lenses to Fujifilm GFX

Adapting lenses delivers degraded results in most cases..

Infrared

Beyond deep red, seeing the invisible..

Ray angle and Color Shading With M Lenses

Off-center color casts, off-center sharpness..

Leica 16-18-21mm f/4 Tri-Elmar-M ASPH

Leica’s ultra wide angle zoom lens..

Leica 18mm f/3.8 Super-Elmar-M ASPH

Leica’s widest prime lens..

Leica 21mm f/3.4 Super-Elmar-M ASPH

Leica’s best-performing 21mm..

Leica 24mm f/3.8 Elmar-M ASPH

Leica’s best-performing 24mm, and with a flat field..

Leica 28mm f/2.8 Elmarit-M ASPH (pre-2016)

Leica’s smallest and lightest M lens with superlative performance..

Leica M 50mm Lenses

Six models to choose from..

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

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

Zeiss ZM 21mm f/4.5 C-Biogon

Zero distortion ultra-wide..

Zeiss ZM 35mm f/1.4 Distagon

Fast and ultra high performance moderate wide angle rangefinder lens..


Blog posts, reverse chronological

2018

2018-10-31 Nikon Z7 Should Be a Solid Leica M and Zeiss ZM Lens Platform Without Modification

2018-10-09 Nikon Z7: Thin 1.1mm Sensor Cover Glass Gives Promise of using M-Mount Lenses with Good Performance

2017

2017-05-03 Fujifilm GFX Sensor Cover Glass Thickness?

2017-05-03 Reader Question: Adapting Medium Format Lenses to the Fujifilm GFX

2015

2015-10-26 Reviewed: Kolarivision-Modified Sony A7R II with Zeiss Batis 25mm f/2 Distagon

2015-10-25 Reviewed: Kolarivision-Modified Sony A7R II with Leica 18mm f/3.8 Super-Elmar-M ASPH

2015-10-24 Reviewed: Kolarivision-Modified Sony A7R II with Leica 28mm f/1.4 Summilux-M ASPH

2015-10-24 Reviewed: Kolarivision-Modified Sony A7R II with Leica 50mm f/2 APO-Summicron-M ASPH

2015-09-03 Kolarivision Sony A7R II with Leica M Lenses: Coming Soon

2015-08-08 Sony A7R II with Leica M Lenses

2015-01-23 Sony Kolarivision A7R.MOD: Summary of Performance (Guide to Mirrorless)

2015-01-17 Modified Sony A7R Sensor Glass: Impact on Rangefinder Lens Performance

2015-01-16 Sony A7R: Sensor Glass Thickness, Ray Angle and Image Degradation: Kolarivision Modification

2014

2014-08-27 Nikon D810: Sensor Cover Glass Quality?

2013

2013-12-01 Sony A7R: Adapting Zeiss and Leica Lenses via Lens Adapter

2013-10-22 Sony NEX A7 and A7r: Leica M Lenses to Work Well?

2013-10-13 Sony Full-Frame NEX A7r: Rangefinder Lenses, Telecentric Design

2013-10-10 Sony NEX A7 and A7r: 24 and 36 Megapixels on Full Frame?

2012

2012-02-26 Reader Asks: Which is Better, Zeiss 21/2.8 Distagon or Leica 21/3.4 SEM ASPH?

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