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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

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

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

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

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

Sharpness and Blur by Optics

Blur from optical behavior or subject-related issue..

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

Spherical Aberration

Diffuse haze at wide apertures..

  1. Spherical Aberration
  2. Examples of Spherical Aberration

Lateral Chromatic Aberration

Understanding lateral chromatic aberration (color fringing)..

  1. Lateral Chromatic Aberration (Color Fringing)

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)

Canon TS-E 90mm f/2.8

Medium telephoto tilt/shift lens.

  1. Aperture Series: Wyman Canyon Lower Cabin (5D Mark III)

Canon 85mm f/1.4L IS USM

Canon’s best-ever medium telephoto and with image stabilization..

  1. Examples: Saddlebag Lake Area
  2. Aperture Series: Hanging Dead Brown Needles Pine Branch

Sigma 24mm f/1.4 DG HSM Art

Sigma’s fast high performance wide angle..

  1. Shootout: Sigma 24/1.4 Art vs Nikon AF-S 24/1.4G (Dolls, NikonD810)

Sigma 35mm f/1.4 DG HSM Art

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

  1. Aperture Series: Red Beater Bike (Nikon D800E)

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
  2. Aperture Series: Wyman Cabin (5D Mark III)

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. Shootout: 58/1.4G vs 50/1.4G, 50/1.8G, 50/1.2 AIS (D800E, Beaver Dam)
  2. Matched Comparison vs 50/1.4G (D800E, Beaver Dam)
  3. Aperture Series: Boulder Logjam (D800E)
  4. Aperture Series: DeChambeau Ranch Outbuilding (D800E)

Nikon AF-S Nikkor 20mm f/1.8G

Nikon’s fast ultra wide angle..

  1. Aperture Series: Green and Orange Pumpkins (D810)
  2. Aperture Series: Sparkling Lake (D810)

Nikon AF-S 24mm f/1.4G ED

State of the art design in a fast 24mm lens. Includes full-resolution images at f/1.4..

  1. Comparison with Nikon 14-24/2.8G and 24/2 AI-S

Olympus Zuiko Auto-S 50mm f/1.2

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

  1. Aperture Series: Poppies and Pots (Sony A7R)
  2. 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)

Nikon AF-S 35mm f/1.4G

State of the art design in a fast 35mm lens..

  1. Aperture Series f/1.4...f/11 — Tree Trunk

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)

Milvus 25mm f/1.4

Highest performing 25mm from Zeiss ever..

  1. Aperture Series: Large Boulder, Waterfall, Last Light on Canyon Ridge
  2. Aperture Series: Colorful Green Boulder, Last Sunset Glow

Milvus 50mm f/1.4

Outstanding build and optical quality in a normal lens..

  1. Aperture Series: Hazy Dawn at Tenaya Lake (Nikon D810)

28mm f/2 Distagon

An artist’s drawing tool..

  1. 28/2 Distagon vs Nikon 28/1.8G, 28/2 AIS, Voigtlander 28/2.8 SL II
  2. Aperture Series: Creekside Yellow Flowers and Dark Rocks, Lundy Creek (Nikon D810)
  3. Aperture Series: White Mountains Landscape (Nikon D810)

35mm f/1.4 Distagon

Strokes of a master..

  1. 35/1.4 Distagon Longitudinal Chromatic Aberration (LOCA)
  2. Aperture Series: Pine Creek Tungsten Mine Buildings / Waterfall
  3. 35/1.4 Distagon Spherical Aberration Assessment
  4. vs Sigma 35/1.4 and Nikon 35/1.4G (Nikon D800E, Wheel)
  5. 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. Otus 55/1.4 APO-Distagon Press Releases
  2. 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: Aspen Leaf on Black Rock (Nikon D810)
  3. Aperture Series: Early Yellow Aspen (Nikon D810)
  4. Aperture Series: Pine Creek Riparian Tree Medley (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 24mm f/1.4 GM

High performance wide angle..

  1. Violet Fringing and Secondary Color Bokeh, Point Spread Function

Sony FE 28mm f/2

Fast wide angle..

  1. Apertures Series: Dolls at Close Range (Sony A7R)

Sony FE 35mm f/1.4 Distagon ZA

Fast and gorgeous moderate wide angle Zeiss design..

  1. Portraits (A7R)
  2. Aperture Series: Assessing Focus Shift and Color Correction (Dolls, A7R)
  3. Examples at f/1.4, Bad Sample Lens #1, Skew/Asymmetry (Pescadero Creek, 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

Sony FE 16-35mm f/4 ZA OSS Vario-Tessar

Comapact ultra-wide zoom for Sony full frame mirrorless..

  1. Aperture Series @ 25mm: Yellow and Blue Bike Close, Focus Shift (Sony A7R)

Sony Cybershot DSC-RX1 / RX1R

Full frame camera in an ultra-compact body with or without anti-aliasing filter..

  1. Aperture Series, Close Range (RX1, Dolls)

Panasonic Leica DG Nocticron 42.5mm f/1.2 ASPH

Fast, bright and highly corrected medium telephoto..

  1. vs Voigtlander Nokton: Olympic Bar (EM1)

Olympus OM-D E-M5

Superb ergonomic design in a compact camera..

  1. Compared: Olympus 50/2 Macro — Panasonic/Leica 45/2.8 Macro — Olympus 45/1.8 (Dolls)

Fujifilm Fujinon XF 56mm f/1.2

A bright short telephoto lens..

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

Zeiss Loxia 35mm f/2 Biogon

Manual focus moderate wide angle for full-frame mirrorless..

  1. Aperture Series: Sparkling Sun on Lake (Evaluating Point Spread Function)

Zeiss Loxia 50mm f/2 Planar

Manual focus normal lens for full-frame mirrorless..

  1. Aperture Series: White Glacial Erratic (Sony A7R)

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)

Zeiss Touit 50mm f/2.8M

Moderate telephoto macro lens for Sony NEX or Fujifilm X. Useful on full frame too!.

  1. Aperture Series: Leaf Closeup at ~1:5 (Sony A7R)

Leica M Monochrom (original)

Ultimate resolution in black and white..

  1. Filters for Black and White

Leica 28mm f/1.4 Summilux-M ASPH

Leica’s fast 28mm..

  1. Secondary Longitudinal Chromatic Aberration (M240)

Leica 35mm f/1.4 Summilux-M ASPH (2010 FLE)

Leica’s superlative and most natural lens for the M..

  1. Aperture Series: 35/1.4 — Glacial Erratics (M240)

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

High performance but flawed 50mm normal lens..

  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 75mm f/2 APO-Summicron-M ASPH

Leica’s medium tele for Leica M..

  1. Aperture Series: Two Aspen (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)

Zeiss ZM 35mm f/1.4 Distagon

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

  1. Aperture Series: Maple Leaf Underwater, Floating Leaves (M240)
  2. Aperture Series: Fading Maple Leaves In Backlit Creek (M240)

Zeiss ZM 85mm f/4 Tele-Tessar

Compact high performance medium telephoto..

  1. Aperture Series: Olympic Bar (M240)

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

2014-05-31 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

2012-07-16 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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