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Sharpness and Blur by Optics

Blur from optical behavior or subject-related issue..

Post Processing for Sharpness

Making image captures look sharp..

Optical Aberrations and Behaviors

Understanding the various optical aberrations and behaviors..

Spherical Aberration

Diffuse haze at wide apertures..

Lateral Chromatic Aberration

Understanding lateral chromatic aberration (color fringing)..

Longitudinal Chromatic Aberration

Understanding Longitudinal (Axial) chromatic aberration (LOCA)..

Secondary Longitudinal Chromatic Aberration

Secondary Longitudinal Chromatic Aberration (SLOCA)..

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..

Photoshop How-To

Working with Photoshop for raw conversion and more..

Voigtlander 90mm f/3.5 APO-Lanthar SL II

Medium telephoto with world-class chromatic correction..

Voigtlander 180mm f/4 APO-Lanthar

Telephoto with world-class chromatic correction..

Sigma 24mm f/1.4 DG HSM Art

Sigma’s fast high performance wide angle..

Sigma 35mm f/1.4 DG HSM Art

Sigma’s fast and affordable moderate excellent wide angle..

Sigma 50mm f/1.4 DG HSM Art

Sigma’s fast high performance normal lens..

Sigma 85mm f/1.4 DG HSM Art

Sigma’s best portrait lens..

Sigma Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

Nikon AF-S Nikkor 58mm f/1.4G

Nikon’s High performance normal lens.

Olympus Zuiko Auto-S 50mm f/1.2

An ultra-fast older design still offers appeal on modern digital..

Coastal Optics 60mm f/4 UV-VIS-IR APO Macro

A superlative multi-spectral lens with perfect color correction..

Nikon AF-S 28mm f/1.8G

A fast moderate wide angle lens with some practical difficulties..

Nikon AF-S 105mm f/1.4E ED

Nikon’s best-ever f/1.4 lens?.

Milvus 50mm f/1.4

Outstanding build and optical quality in a normal lens..

Milvus 85mm f/1.4

Outstanding build and optical quality in a medium tele..

Milvus 100mm f/2M

The classic 100/2 Makro-Planar improved..

28mm f/2 Distagon

An artist’s drawing tool..

35mm f/1.4 Distagon

Strokes of a master..

Otus 28mm f/1.4 APO-Distagon

Fast high performance APO wide angle..

Otus 55mm f/1.4 APO-Distagon

Ultra high performance apochromatic normal lens, first in the Otus line..

Otus 85mm f/1.4 APO-Planar Rendering Style

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

85mm f/1.4 Planar

True-to-life imagery..

100mm f/2 Makro-Planar

King of bokeh! Corner-to-corner sharpness, world class..

135mm f/2 APO-Sonnar

Beautiful bokeh, razor sharp, superb color correction..


Blog posts

2018

2018-07-31 Zeiss Milvus 100mm f/2M Color Correction Shootout vs Nikon 105mm f/2 DC and Sigma 105mm f/1.4 DG HSM Art: Glacial erratic and eroded pine stump

2015

2015-09-16 Leica 28mm f/1.4 Summilux-M ASPH: Analysis/Example of SLOCA (Secondary Longitudinal Chromatic Aberration)

2015-09-13 On Secondary Color: Collective Context-Dropping regarding Zeiss Milvus 50/1.4 Distagon

2015-03-16 Manzanar (WW II Relocation Camp for Japanese Americans)

2014

2014-07-11 B&H Photo Now Offers Free Expedited Shipping (1/2/3 days depending on location)

2014-06-07 Sigma 50mm f/1.4 DG HSM: Discussing Optical and Autofocus Expectations, LOCA

2014-05-31 Zeiss 85mm f/1.4 Planar: Dual-Focus Aperture Series 'Radio Towers' (D800E)

2014-04-08 Color Correction (LOCA, Secondary LOCA, LACA)

2013

2013-04-10 Leica M Monochrome with Color Filters and Leica 50mm f/2 APO-Summicron-M ASPH

2012

2012-09-11 New Article in Workflow: Local Contrast enhancement

2012-07-16 Understanding Longitudinal Chromatic Aberration with the Zeiss 100mm f/2 Makro-Planar

2012-05-21 Filtration for Leica M Monochrom to Improve Image Sharpness and Tonal Separation

2010

2010-05-20 Global cooling? Local at least.

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