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rearward focus shift

optical behavior in which the centering of the zone of sharpness moves to greater distance with stopping down

See also: optical focus shift
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2022-08-18 Fujifilm GF 110mm f/2 Focus Shift Evaluation and Mitigation: Deck and Roof (GFX100S)

2021-07-07 Voigtlander FE 35mm f/2 APO-Lanthar: Focus Shift in Landscapes, Patriarch Grove

Focus Shift (Case Studies)

Focus shift with a variety of lenses..

1. Focus Shift Over the Frame, Nikon 14-24mm f/2.8G (Cabin)

Sigma L-Mount

Sigma 28mm f/1.4 DG HSM Art.

1. Aperture Series, Leica SL2 vs Panasonic S1R Sharpness: Desert Sagebrush
2. Shootout: Leica 28/2 APO-Summicron-SL vs Leica 28/1.4 Summilux-M, Leica 28/2 Summicron-M, Sigma 28/1.4 DG HSM Art: Popcorn and Pumpkins (Leica SL2)

Leica 28mm f/2 APO-Summicron-SL ASPH

Fast short wide angle lens for L-Mount cameras..

1. Shootout: Leica 28/2 APO-Summicron-SL vs Leica 28/1.4 Summilux-M, Leica 28/2 Summicron-M, Sigma 28/1.4 DG HSM Art: Popcorn and Pumpkins (Leica SL2)
2. Aperture Series: Oily Blue Water among Orange Streambed Rocks (Leica SL2)
3. Aperture Series: Stagnant Tenaya Creek in Forest (Leica SL2)
4. Aperture Series: Pool at Base of Dry Waterfall, Tenaya Creek (Leica SL2)

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

Fast short normal lens for L-Mount cameras..

1. Aperture Series: Backlit Pines among Glacial Erratics fronting Granite Cliff
2. Aperture Series: Backlit Open Forest
3. Aperture Series: View Through Trees towards Cloud’s Rest

Leica 90mm f/2 APO-Summicron-SL ASPH

Fast short telephoto lens for L-Mount cameras..

1. Aperture Series: Mosaic, Focus Shift Evaluation

Pentax HD DA Limited 40mm f/2.8

APS-C slightly tele normal lens equivalent to 60mm on full-frame..

1. Aperture Series: Sidelit Barn (Pentax K3)

Pentax HD DA Limited 70mm f/2.4

APS-C moderate telephoto equivalent to 105mm on full-frame..

1. Aperture Series: Sidelit Barn (Pentax K3)

Sigma 12-24mm f/4 DG HSM Art

Fast constant-aperture ultrawide zoom..

1. Aperture Series @ 14mm: Two Aspen
2. Aperture Series @20mm: Forest Stream

Sigma 50mm f/1.4 DG HSM Art

Sigma’s fast high performance normal lens..

1. Sigma 50/1.4A vs Nikon 50/1.4G, 50/1.8G (Nikon D810, Decorated Bike)

Nikon AF-S Nikkor 20mm f/1.8G

Nikon’s fast ultra wide angle..

1. Focus Shift: 20/1.8G vs 14-24/2.8G (D810, Rulers)

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. Aperture Series: Sunrise Glow on Lundy Creek (Nikon D800E)

Nikon AF-S 14-24mm f/2.8G ED

Nikon’s ultra wide angle zoom and the Nikon 14mm f/2.8, critical focus shift behavior..

1. Focus Shift: Nikon 14-24 Across The Frame, Focus f/2.8 vs f/5.6 (Cabin)

Schneider Kreuznach LS 35mm f/3.5

Wide angle 24mm equivalent for Phase One XF system.

1. Aperture Series: Mosaic (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 @ 80mm: Mosaic (IQ4 150)

Schneider Kreuznach LS 150mm f/2.8 IF

Medium telephoto 100mm equivalent for Phase One XF system.

1. Aperture Series: Plant Life on Silver Canyon Hillside (IQ4 150)
2. Aperture Series: Clearing Snowstorm, Lundy Canyon View to Mono Lake (IQ4 150)

Fujifilm GFX100S/100 Comparisons

Is 100 better than 45/50/60 megapixels?.

1. SHOOTOUT: Fujifilm GFX100S vs Sony A1: Deck and Roof

Fujifilm GF 35-70mm f/4.5-5.6

Compact wide angle.

1. Aperture Series @ 35mm: Huge Laurel Along Alpine Creek
2. SHOOTOUT: Fujifilm GFX100S vs Sony A1: Deck and Roof

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

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

1. Compared: Fujifilm GF 45-100mm f/4 vs GF 50mm f/3.5: View Towards Mt Whitney

Fujifilm GF 50mm f/3.5 R LM WR

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

1. Compared: Fujifilm GF 50mm f/3.5 vs GF 45-100mm f/4: View Towards Mt Whitney

Fujifilm GF 110mm f/2 R WR

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

1. Focus Shift Evaluation and Mitigation: Deck and Roof (GFX100S)

Hasselblad XCD 21mm f/4

18mm equivalent..

1. Aperture Series: Curvy Grade, Colorado National Monument
2. Aperture Series: Canyon Cliff, Colorado National Monument

Hasselblad XCD 38mm f/2.5 V

Normal lens equivqlent to 32mm..

1. Focus Shift for Hasselblad XCD 38mm f/2.5 V, Ruler Example
2. Aperture Series: Curvy Grade, Colorado National Monument
3. Aperture Series: First Sun, View to Wyman Canyon
4. Aperture Series: Wooden Boardwalk, Dusk

ZF.2/ZE 21mm f/2.8 Distagon

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

1. Focus Shift Assessment vs Nikon 20/1.8G and 14-24/2.8G

135mm f/2 APO-Sonnar

Beautiful bokeh, razor sharp, superb color correction..

1. vs Sigma 135mm f/1.8 Art and Nikon 70-200mm f/2.8 FL ED VR: White Flowers (Nikon D810)

Canon EOS R5

Canon’s high-res mirrorless..

1. Focusing Accuracy

Canon RF 14-35mm f/4L IS USM

Compact ultra-wide zoom..

1. Shootout @ 31mm vs Canon RF 14-35/4L, Canon RF 24-70/2.8L: Bonsai Juniper Over Beaver Pond

Canon RF 15-35mm f/2.8L IS USM

Fast ultra wide zoom lens..

1. Aperture Series @ 19mm: Trailside Juniper with Lopped Roots
2. Aperture Series @ 24mm: Ancient Log
3. Aperture Series @ 27mm: Riparian Tree Trunks
4. Shootout @ 31mm vs Canon RF 14-35/4L, Canon RF 24-70/2.8L: Bonsai Juniper Over Beaver Pond
5. Aperture Series @ 35mm: Aerial View of Pine Creek Mine

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

Fast standard zoom lens..

1. Shootout @ 31mm vs Canon RF 14-35/4L, Canon RF 24-70/2.8L: Bonsai Juniper Over Beaver Pond

Canon RF 35mm f/1.8 Macro STM

All-arounder compact lens with macro capability..

1. Focusing Accuracy on Canon EOS R5
2. Aperture Series: Alpine Creek (EOS R5)

Nikon NIKKOR Z 50mm f/1.8 S

Normal lens expressly designed for Nikon Z cameras..

1. Shootout vs Nikon Z 24-70/4: Mining Gears

Sony FE 35mm f/1.4 GM

High performance mild wide-angle..

1. Shootout vs Voigtlander FE 35/2 APO-Lanthar: Pine Creek Cliffs
2. Shootout vs Voigtlander FE 35/1.4 GM: Patriarch Grove

Sigma FE 28mm f/1.4 DG HSM Art

Outstanding wide angle, watch out for lens skew..

1. Focus Shift

Sigma FE 85mm f/1.4 DG DN Art

Ultra high performance medium telephoto..

1. Aperture Series: Frog on Table
2. Aperture Series: Glass Vase
3. Aperture Series: Kitchen Countertop
4. Aperture Series, Close Range: Dolls (with and without Distortion Correction)
5. Aperture Series: Last Yellow Aspen at Edge Of Beaver Pond
6. Aperture Series: Campito the Feral Stallion Grazing in Blue Dusk
7. Aperture Series: Mining Hoist
8. Aperture Series: Earth Shadow Rising Over Crooked Creek Research Station

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical

High-grade manual focus wide-normal lens..

1. Focus Shift Evaluation: Deck Planks
2. Aperture Series: Pine Creek Mining Buildings
3. Aperture Series: Mining Cabin Interior
4. Aperture Series: Aspen Trunks, Early Morning Light
5. Aperture Series: White Tops of White Mountains
6. Focus Shift Evaluation: Rulers and Soil
7. Focus Shift, Comparing and Mitigating (Roof and Deck)
8. Focus Shift in Landscapes, Patriarch Grove
9. Focus Shift in Landscapes, Greenstone Lake
10. Shootout vs Sony FE 35/1.4 GM, Sigma FE 35/2 DG DN: Pine Creek Cliffs
11. Shootout vs Sony FE 35/1.4 GM: Patriarch Grove
12. Shootout vs Sony FE 24-70mm f/2.8 GM II (Deck and Roof)

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

Ultra high grade performer at a modest price..

1. Shootout @ 65mm vs Voigtlander FE 65/2 APO-Macro-Lanthar (Deck and Roof)

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)

Sony FE 24-70mm f/2.8 GM II

Premiere mid-range zoom for Sony full frame mirrorless.

1. Aperture Series @ 70mm: Deck and Roof
2. Aperture Series @ 63mm: Cabin at Sunrise
3. Shootout @24mm vs Sony FE 12-24mm f/2.8 GM, Zeiss Loxia 25/2.4 (Deck and Roof)
4. Shootout @ 35mm vs Voigtlander FE 35/2 APO-Lanthar (Deck and Roof)
5. Shootout @ 65mm vs Voigtlander FE 65/2 APO-Macro-Lanthar (Deck and Roof)

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. 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
3. Shootout @24mm vs Sony FE 12-24//2.8 GM, Sony FE 24-70/2.8 GM II (Deck and Roof)

Leica 28mm f/1.4 Summilux-M ASPH

Leica’s fast 28mm..

1. Aperture Series: Backlit Snowy Meadow (Leica M10 Monochrome)

Leica 28mm f/2 Summicron-M ASPH (pre-2016)

Leica’s widest lens utilizing built-in frame lines..

1. Aperture Series: Bare Branches Riparian Tree (M11)
2. Compared: 28/2 Summicron vs 28/2.8 Elmarit (M9, Death Valley, Leadville)
3. 28/2.8 vs 28/2 Death Valley Water Tank (M9P)

Leica 28mm f/2 Summicron-M ASPH (2016)

Tweaked 2016 redesign..

1. Focusing Behavior in Live View vs Predecessor

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

High performance but flawed 50mm normal lens..

1. Focus Shift with the 50/2 APO ASPH (Pellegrino Bottles)

Leica 75mm f/2 APO-Summicron-M ASPH

Leica’s medium tele for Leica M..

1. Aperture Series: Persimmon Tree Trunk (M11)
2. Aperture Series: Pumpkins (M11)

Leica 100mm f/2.8 APO-Macro-Elmarit-R

Superb all-around macro and general-purpose lens..

1. Aperture Series: Electrical Substation (M240)

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 (Wyman Cabin, M240)
2. 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 (Aspen Trunk, M240)

Zeiss ZM 85mm f/4 Tele-Tessar

Compact high performance medium telephoto..

1. Aperture Series: Teak Bench at Dusk with Grass (M240)

Blog posts, reverse chronological

2022

2022-08-18 Fujifilm GF 110mm f/2 Focus Shift Evaluation and Mitigation: Deck and Roof (GFX100S)

2021

2021-07-07 Voigtlander FE 35mm f/2 APO-Lanthar: Focus Shift in Landscapes, Patriarch Grove