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Newest blog posts

2015-09-17 King of Bokeh, well-controlled SLOCA?

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

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

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

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

View all related blog posts...

Sharpness and Blur by Optics

Blur from optical behavior or subject-related issue..

  1. Blur by Violet Fringing (Longitudinal Chromatic Aberration aka LOCA)

Longitudinal Chromatic Aberration

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

  1. Longitudinal Chromatic Aberration (LOCA / Violet Fringing)
  2. Examples of Violet Fringing from Longitudinal Chromatic Aberration (LOCA)
  3. Violet Fringing Case Study (LOCA with Zeiss Otus vs Others)
  4. Violet Fringing Case Study (LOCA with Zeiss 85mm and Leica 90mm)
  5. Correcting Longitudinal Chromatic Aberration During RAW Conversion

Secondary Longitudinal Chromatic Aberration

Secondary Longitudinal Chromatic Aberration (SLOCA)..

  1. Secondary Longitudinal Chromatic Aberration (Color Bokeh)
  2. Mitigating Longitudinal Chromatic Aberration by Stopping Down
  3. What Perfect Correction for LOCA Looks Like
  4. Examples of Secondary Longitudinal Chromatic Aberration
  5. Case Study: Secondary Color Variance with Focus

How to Test A Lens

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

  1. Testing for Longitudinal Chromatic Aberration (LOCA)

Optical Behavior (Case Studies)

Illuminating examples of lens behavior..

  1. Leica 50mm f/0.95 Noctilux-M ASPH Aberrations

Voigtlander 90mm f/3.5 APO-Lanthar SL II

Medium telephoto with world-class chromatic correction..

  1. Aperture Series: Shimano Drive Train (Sony A7R II)

Voigtlander 180mm f/4 APO-Lanthar

Telephoto with world-class chromatic correction..

  1. Aperture Series: Shimano Drive Train (Sony A7R II)

Sigma 50mm f/1.4 DG HSM Art

Sigma’s fast high performance normal lens..

  1. Sigma 50/1.4A: Color Correction and LOCA, Implications

Sigma Telephoto APO Macro Lenses: 150mm, 180mm

Sigma’s fast telephoto APO macro lenses..

  1. Sigma 180/2.8 APO vs Leica 180/2.8 APO vs Voigtlander 180/4 APO
  2. APO.chromatic: Sigma 180 and 150 + Leica 180/2.8, Voigtlander 180/4 + Nikon 70-200/2.8 VRII

Nikon AF-S Nikkor 58mm f/1.4G

Nikon’s High performance normal lens.

  1. Matched Comparison vs 50/1.4G (D800E, Beaver Dam)
  2. Aperture Series: Boulder Logjam (D800E)

Olympus Zuiko Auto-S 50mm f/1.2

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

  1. Aperture Series: Teak Bench, Pots, Grasses (Sony A7R)

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

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

  1. Zero Longitudinal Chromatic Aberration

Nikon AF-S 28mm f/1.8G

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

  1. Examples (Dana Meadow Portraits)

Rolleiflex Hy6 Mod 2 Medium Format System

Lens performance at 80 megapixels..

  1. Aperture Series: Up the Creek (Rolleiflex AFD 80mm f/2.8 Apogon PQS)
  2. Aperture Series: Down Creek (Zeiss 110/2 Planar PQ)

28mm f/2 Distagon

An artist’s drawing tool..

  1. Aperture Series: Creekside Yellow Flowers and Dark Rocks, Lundy Creek (Nikon D810)

35mm f/1.4 Distagon

Strokes of a master..

  1. 35/1.4 Distagon Longitudinal Chromatic Aberration (LOCA)
  2. 35/1.4 Distagon Spherical Aberration Assessment
  3. vs Sigma 35/1.4 (Nikon D800E, Boulder Logjam)

Otus 28mm f/1.4 APO-Distagon

Fast high performance APO wide angle..

  1. Aperture Series: Secondary Color (SLOCA) and Field Curvature at Close Range

Otus 55mm f/1.4 APO-Distagon

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

  1. Whither Longitudinal Chromatic Aberration?

Otus 85mm f/1.4 APO-Planar Rendering Style

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

  1. Aperture Series: Atlas Permaguard (Nikon D810)
  2. Aperture Series: Early Yellow Aspen (Nikon D810)

85mm f/1.4 Planar

True-to-life imagery..

  1. Aperture Series: Radio Towers (Nikon D800E)

100mm f/2 Makro-Planar

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

  1. Violet Fringing (LOCA) vs Aperture (Sunlit Water Bottles)

135mm f/2 APO-Sonnar

Beautiful bokeh, razor sharp, superb color correction..

  1. Compared to Nikon 135mm f/2 DC (D800E, Rulers on Table)
  2. Compared to Zeiss 100mm f/2 Makro-Planar (D800E, Rulers on Table)
  3. Compared to Canon 135mm f/2L (Canon 5D Mark III, Dolls)
  4. APO Behavior vs Leica R APO 100/2.8 and 180/2.8

Sony FE 35mm f/1.4 Distagon ZA

Fast and gorgeous moderate wide angle Zeiss design..

  1. Aperture Series: Assessing Focus Shift and Color Correction (Dolls, A7R)

Sony FE 55mm f/1.8 ZA Sonnar

Compact normal lens for full-frame Sony mirrorless..

  1. Aperture Series: Creek Wends its Way Through Boulders (Sony A7R)

Voigtlander FE 65mm f/2 Macro APO-Lanthar Aspherical

Ultra high grade performer at a modest price..

  1. Examples: Secondary Color Correction

Fujifilm Fujinon XF 56mm f/1.2

A bright short telephoto lens..

  1. Aperture Series: Picnic Table (X-T1)

Zeiss Batis 25mm f/2 Distagon

Autofocus wide angle for Sony full-frame mirrorless..

  1. Aperture Series: Water Through the Boulders (Sony A7R)

Zeiss Batis 40mm f/2

All-around slightly wide angle/normal with close focus..

  1. Longitudinal and Secondary Longitudinal Chromatic Aberration

Zeiss Batis 85mm f/1.8 Sonnar

Autofocus portrait lens for Sony full-frame mirrorless..

  1. Aperture Series: Sculptured Elegance (Sony A7R)

Leica 28mm f/1.4 Summilux-M ASPH

Leica’s fast 28mm..

  1. Secondary Longitudinal Chromatic Aberration (M240)

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

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

  1. Color Bokeh (Secondary Longitudinal Chromatic Aberration, Dolls)
  2. Aperture Series: Bikes at Night (Sony A7R)
  3. Aperture Series: Bleached Bristlecone Logs at Blue Dusk (M240)

Leica 180mm f/2.8 APO-Elmarit-R

World’s best mid-range telephoto lens..

  1. vs Sigma 180/2.8 APO and Voigtlander 180/4 APO (D800E, Dolls)
  2. vs Sigma 150/2.8 APO, 180/2.8 APO, Voigtlander 180/4 APO, Nikon 70-200 VR2 (D800E, Rulers)

Blog posts, reverse chronological

2015

2015-09-17 King of Bokeh, well-controlled SLOCA?

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

2014

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

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

2012

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

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