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peripheral forward field curvature

Curved field of focus in which outer zones focus closer to the camera than the central area.

See also: field curvature
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2019-11-22 Making Sharp Images: Case Study: Major Sharpness Gains via Ideal Focus with Lenses having Peripheral Forward Field Curvature (Pine Creek High Peaks)

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)

Focus Stacking Examples

Examples of Focus Stacking..

1. Example: Medium-Far Range (Two Bristlecone Logs on Hillside)
2. Example: Vista at 85mm (View North in Blue Dusk from Pothole Dome)

Nikon 85mm f/2.8D PC-E Micro-Nikkor

Medium telephoto tilt/shift macro focusing lens.

1. Aperture Series: Wyman Canyon Lower Cabin (Nikon D800E)

Pentax HD DA 24-70mm f/2.8 SDM ED

Bread and butter zoom lens..

1. Aperture Series @ 24mm: Sunset over Snowy Landscape, White Mountains View to Sierra Nevada
2. Aperture Series @ 29mm: Backlit Sprinter on White Mountain Road
3. Aperture Series @ 40mm: Snowy Landscape at Dusk, View Towards Big Pine

Sigma 14-24mm f/2.8 DG HSM Art

Superwide optimized zoom lens..

1. Aperture Series @ 17mm: Cracked Mud Patterns in Sand Dunes to Distant Peaks at Sunrise, Death Valley
2. Aperture Series @ 20mm: Flowering Creosote Bush in Sand Dunes, Figure on Dune, Death Valley
3. Aperture Series @ 23mm: Sandy Wash in Side Canyon, Zion

Sigma 24-35mm f/2 DG HSM Art

Mid-range optimized groundbreaking f/2 zoom..

1. Shootout: vs Sigma 35/1.4A: Cottonwood Canyon Rancher’s Cabin

Sigma 14mm f/1.8 DG HSM Art

A whopping 4/3 stop faster than other lenses in its range..

1. Examples: Eastern Sierra

Nikon AF-S Nikkor 20mm f/1.8G

Nikon’s fast ultra wide angle..

1. Aperture Series: Pine Creek Sun Wedge (D810)
2. Aperture Series: Pine Lake Peak, Last Kiss of Sunlight (D810)

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

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

1. Aperture Series: Dense Stand of White Aspen (Nikon Z7)
2. Aperture Series: Dense Stand of Aspen to Mountainside of Scrub Aspen (Nikon Z7)

Schneider Kreuznach LS 35mm f/3.5

Wide angle 24mm equivalent for Phase One XF system.

1. Aperture Series: Mosaic (IQ4 150)
2. Aperture Series: Alabama Hills Creekbed, Late Dusk (IQ4 150)
3. Examples: Eastern Sierra (IQ4 150)

Schneider Kreuznach LS 40-80mm f/4-5.6

Mid range zoom 27-54mm equivalent for Phase One XF system.

1. Aperture Series @ 40mm: Mosaic (IQ4 150)
2. Aperture Series @ 55mm: Mosaic (IQ4 150)
3. Examples: EasternSierra (IQ4 150)

Fujifilm GF 30mm f/3.5 R LM WR

Compact wide angle.

1. Aperture Series: Greenstone Lake with Mt Conness Peaks
2. Aperture Series: Snow and Ambiguous Cliff

Fujifilm GF 32-64mm f/4 R LM WR

Mid-range zoom lens equivalent to 26-53mm f/3.3..

1. Shootout @ 50mm vs GF 35-70, GF 32-64/4: Huge Laurel Along Alpine Creek

Fujifilm GF 35-70mm f/4.5-5.6

Compact wide angle.

1. Shootout @50mm vs GF 35-70, GF 32-64/4: Huge Laurel Along Alpine Creek

Fujifilm GF 45mm f/2.8 R WR

Moderate wide angle equivalent to 37mm f/2.3..

1. Aperture Series: Mosaic (GFX100)
2. Aperture Series with Focus Stack: Light-Colored Boulder Amid Sage and Boulder Field (GFX 50S)

Fujifilm GF 45-100mm f/4 R LM OIS WR

Slightly long zoom lens equivalent to 37-82mm f/3.3..

1. Aperture Series @ 56mm: Alabama Hills Desert Wash, Sunrise View To Mt Whitney

Fujifilm GF 50mm f/3.5 R LM WR

Slightly wide compact normal lens equivalent to 41mm f/2.9..

1. Shootout @ 50mm vs GF 35-70, GF 32-64/4: Huge Laurel Along Alpine Creek

Fujifilm GF 80mm f/1.7 R WR

Standard normal lens equivalent to 66mm f/1.4..

1. Aperture Series: View over Patriarch Grove to Southwest

Fujifilm GF 110mm f/2 R WR

Ultra high speed telephoto equivalent to 90mm f/1.6..

1. Shootout: Fujifilm GF 110mm f/2 R WR vs Fujifilm GF 100-200mm f/5.6: Mosaic with Unstable Lens Focus (GFX100)

Hasselblad X2D 100C

Mirrorless large format with leaf shutter lenses, 3rd generation..

1. Long Exposures (Hasselblad XCD 38/2.5)

Hasselblad XCD 38mm f/2.5 V

Normal lens equivqlent to 32mm..

1. Long Exposures (Hasselblad XCD 38/2.5)

Milvus 15mm f/2.8

Milvus garb for the venerable 15/2.8 Distagon, with improved lens coating..

1. Aperture Series: Dead Pines in Defunct Beaver Pond (Multi-Shot HighRes mode)

18mm f/3.5 Distagon

A brilliant, but also colorful character..

1. Aperture Series: Wyman Canyon Lower Cabin Interior (Nikon D800E)

ZF.2/ZE 21mm f/2.8 Distagon

Brilliant imaging, even wide open, but with a few quirks. (Review in progress) .

1. Examples: Lundy Canyon, Drowned Conifers at Dusk

Otus 28mm f/1.4 APO-Distagon

Fast high performance APO wide angle..

1. Overview of Otus 28/1.4 APO-Distagon
2. Examples: Focus Stacking
3. Aperture Series: Secondary Color (SLOCA) and Field Curvature at Close Range
4. Aperture Series (night): Post Office Boxes

Otus 85mm f/1.4 APO-Planar

Ultra high performance apochromatic medium telephoto, overview and technical..

1. Field Curvature Analysis (Nikon D810, Mosaic)

Canon RF 24-70mm f/2.8L IS USM

Fast standard zoom lens..

1. Aperture Series @ 24mm: Cottonwoods along Irrigation Ditch

Canon RF 35mm f/1.8 Macro STM

All-arounder compact lens with macro capability..

1. Aperture Series: Alpine Creek (EOS R5)

Nikon NIKKOR Z 24-70mm f/2.8 S

Fast mid-range zoom expressly designed for Nikon Z cameras..

1. Aperture Series @ 24mm: Natural Bonsai Over Beaver Pond

Nikon NIKKOR Z 24-70mm f/4 S

Mid-range zoom expressly designed for Nikon Z cameras..

1. Aperture Series @ 70mm: Conness Creek Lower Waterfall

Sony A7R V

5th Generation standard-setting camera..

1. Focus Bracketing Example @ 12mm: Failure to Reach INF, Chocolate Brown Alpine Creek

Sony Alpha A7R IV

4th Generation standard-setting camera..

1. Shootout of Sony A7R IV vs Sony A7R III: View Past Greenstone Lake to North Peak

Sony FE 24mm f/2.8 G

High performance, high speed..

1. Aperture Series: Deck Planks — Getting Optimal Results by Understanding Focus Shift, Field Curvature, Distortion Correction
2. Aperture Series: Fenceline, with/without Distortion Correction

Sony FE 35mm f/1.4 GM

High performance mild wide-angle..

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

Sony FE 40mm f/2.5 G

High performance, high speed..

1. Aperture Series: Backlit Deck and Backyard

Sony FE 50mm f/2.5 G

High performance, high speed..

1. Shootout: Sony FE 50/2.5G vs Voigtlander FE 50/2 APO-Lanthar — Backlit Deck and Backyard

Sigma FE 24-70mm f/2.8 DG DN Art

Native-mount mid-range zoom for mirrorless..

1. Aperture Series @30mm: Mining Cylinder

Sigma FE 35mm f/1.2 DG DN Art

Ultra high speed native-mount moderate wide angle..

1. Shootout: Sigma 35mm f/1.2 DG DN Art vs Zeiss Loxia 35mm f/2: Twenty Lakes Basin, View Towards Mt Conness Drainage (Sony A7R IV)

Sigma FE 135mm f/1.8 DG HSM Art

Outstanding fast wide angle, DSLR optical design..

1. Aperture Series: Ducks in Dana Meadow Pond at Dusk

Voigtlander FE Heliar-Hyper 10mm f/5.6 Aspherical III

Anything wider would be a fisheye..

1. Aperture Series: Snowy Road (Sony A7R II)
2. Examples: White Mountains Snow and Cabins (Sony A7R II)

Voigtlander FE 35mm f/1.2 Aspherical

Fast mild wide angle lens..

1. Aperture Series: Oak Tree Trunks

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical

High-grade manual focus wide-normal lens..

1. Focus Shift in Landscapes, Greenstone Lake
2. Shootout vs Sony FE 35/1.4 GM, Sigma FE 35/2 DG DN: Pine Creek Cliffs

Voigtlander FE 50mm f/2 APO-Lanthar Aspherical

High-grade manual focus normal lens..

1. Shootout: Sony FE 50/2.5G vs Voigtlander FE 50/2 APO-Lanthar — Backlit Deck and Backyard

Sony FE 12-24mm f/2.8 GM

Fast extreme wide angle zoom..

1. Shootout @ 24mm: Sony FE 12-24mm f/2.8 GM vs Zeiss Loxia 25mm f/2.4 vs Sigma FE 14-24mm f/2.8 DG DN Art: Brilliant Backlit Beaver Pond Meadow
2. Shootout @24mm vs Sony FE 24-70/2.8 GM II, Zeiss Loxia 25/2.4 (Deck and Roof)
3. Focus Bracketing Example @ 12mm: Failure to Reach INF, Chocolate Brown Alpine Creek

Sony FE 20-70mm f/4 G

Wide range zoom aimed at bloggers..

1. Aperture Series @ 21mm: Huge Laurel at Bend in Alpine Creek
2. Aperture Series @ 24mm: Riparian Spring Green, Alpine Creek
3. Aperture Series @ 28mm: Alpine Creek
4. Aperture Series @ 34mm: Riparian Spring Green, Alpine Creek
5. Aperture Series @ 52mm: Riparian Spring Green, Alpine Creek

Sony FE 24-70mm f/2.8 GM II

Premiere mid-range zoom for Sony full frame mirrorless.

1. Shootout @24mm vs Sony FE 12-24mm f/2.8 GM, Zeiss Loxia 25/2.4 (Deck and Roof)

Panasonic Leica DG Vario-Elmarit 8-18mm f/2.8-4 ASPH

Compact wide angle equivalent to 16-36mm..

1. Examples: Trona / Panamint Area

Panasonic Leica Summilux 12mm f/1.4 ASPH

Fast, bright and well corrected wide angle..

1. Examples: Around the Neighborhood

Zeiss Loxia 21mm f/2.8 Distagon

Outstanding ultra wide angle performer..

1. Examples: White Mountains Before Snowstorm (A7R II)
2. Aperture Series: Aspen Up, Morning Sunstar (A7R II)
3. Aperture Series (Night): Arcade View at Night (A7R II)

Zeiss Loxia 25mm f/2.4 Distagon

Outstanding wide angle, superb performer..

1. Aperture Series: Bristlecone Logs View to Bristlecone Graveyard, Dusk Purple Sky (Sony A7R IV)
2. Aperture Series: Spring Leaves Emerge On Riparian Tree
3. Shootout @ 24mm: Zeiss Loxia 25mm f/2.4 vs Sony FE 12-24mm f/2.8 GM vs Sigma FE 14-24mm f/2.8 DG DN Art: Brilliant Backlit Beaver Pond Meadow
4. Shootout @24mm vs Sony FE 12-24//2.8 GM, Sony FE 24-70/2.8 GM II (Deck and Roof)

Zeiss Loxia 35mm f/2 Biogon

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

1. Shootout: Zeiss Loxia 35mm f/2 vs Sigma 35mm f/1.2 DG DN Art: Twenty Lakes Basin, View Towards Mt Conness Drainage (Sony A7R IV)

Leica 24mm f/3.8 Elmar-M ASPH

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

1. Aperture Series: Lone Pine Peak and Mt Whitney Sunrise from Alabama Hills
2. Aperture Series: Ancient Tree Trunk at Lone Pine Lake

Zeiss ZM 35mm f/1.4 Distagon

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

1. 6-way Shootout: ZM 35/1.4 vs 35/2 and 35/2.8, Leica 35/1.4 and 35/2, Voigtlander 35/1.2 (Pine Creek Morning, M240)

Voigtlander Ultron 21mm f/1.8

Fast high performance wide angle..

1. Aperture Series: Wyman Canyon Lower Cabin Exterior (M240)
2. Compared: vs Leica 21/3.4 SEM and Voigtlander 21/4 (M240, Wyman Cabin Interior)

Blog posts, reverse chronological

2019

2019-11-22 Making Sharp Images: Case Study: Major Sharpness Gains via Ideal Focus with Lenses having Peripheral Forward Field Curvature (Pine Creek High Peaks)