Specifications#
- Brand
- Panasonic
- Model
- G 20mm f/1.7 II Asph.
- Lens type
- Standard prime
- Focal length
- 20 mm
- Maximum aperture
- f/1.7
- Image circle
- Four Thirds (17.3×13 mm)
- Mount(s)
- Micro Four Thirds
- Projection
- Rectilinear
- Lensfun correction profile
- Yes — distortion/vignetting/TCA
Equivalent focal length on different cameras#
Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).
| Camera format | At 20 mm | Equiv. aperture (DoF) |
|---|---|---|
| Micro Four Thirds | 40 mm · 57° | f/3.4 |
Depth of field & background blur#
Computed on its native Four Thirds format (CoC 15 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 20 mm f/1.8 on four thirds.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 20 mm | f/1.7 | 12.5 cm | 51.3 cm | 3.53 m | 21.4 m | 15.7 m | 0.7% |
| 20 mm | f/4 | 30.1 cm | 1.30 m | 16.9 m | ∞ | 6.68 m | 0.3% |
| 20 mm | f/8 | 64.4 cm | 3.67 m | ∞ | ∞ | 3.35 m | 0.1% |
Handheld & night-sky limits#
NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).
| Body | Min. handheld shutter (longest focal) | 500 rule at 20 mm | NPF at 20 mm, f/1.7 |
|---|---|---|---|
| Micro Four Thirds | 1/40 s | 12 s | 8 s |
Compatible cameras#
Bodies in our database with a native Micro Four Thirds mount.
- OM System OM-3 2025
- Panasonic Lumix DC-GH7 2024
- OM System OM-1 Mark II 2024
- Panasonic Lumix DC-G9M2 2023
- Panasonic Lumix DC-GH6 2022
- OM System OM-1 2022
- OM System OM-5 2022
- Panasonic Lumix DC-GH5M2 2021
- OM System PEN E-P7 2021
- Olympus OM-D E-M1 Mark III 2020
- Olympus OM-D E-M10 Mark IV 2020
- Olympus OM-D E-M5 Mark III 2019
- Olympus OM-D E-M1X 2019
- Olympus PEN E-PL9 2019
- Panasonic Lumix DC-GH5S 2018
- Panasonic Lumix DC-GX9 2018
- Panasonic Lumix DC-G9 2017
- Panasonic Lumix DC-GH5 2017
- Olympus OM-D E-M10 Mark III 2017
- Panasonic Lumix DC-GX850/GX800 2017
- Olympus OM-D E-M1 Mark II 2016
- Olympus OM-D E-M5 Mark II 2015
- Panasonic Lumix DMC-GX8 2015
- Panasonic Lumix DMC-GH4 2014
- Olympus OM-D E-M1 2013
- Panasonic Lumix DMC-GX7 2013
- Olympus PEN E-P5 2013
- Olympus PEN E-PL5 2012
- Olympus OM-D E-M5 2012
- Olympus PEN E-P3 2011
- Olympus PEN E-PM1 2011
- Olympus E-PL2 2011
- Olympus PEN E-PL1 2010
- Panasonic Lumix DMC-G2 2010
- Olympus PEN E-P1 2009
- Olympus PEN E-P2 2009
- Panasonic Lumix DMC-GF1 2009
- Panasonic Lumix DMC-GH1 2009
- Panasonic Lumix DMC-G1 2008
- Leica Digilux 3 2006
Adapt it to other systems#
Similar lenses#
- OM System 20mm F1.4 f/1.4
- Panasonic G 20mm f/1.7 Asph. f/1.7
- Olympus M.Zuiko Digital 25mm f/1.8 f/1.8
- Olympus M.Zuiko Digital ED 25mm f/1.2 Pro f/1.2
- Panasonic G 25mm f/1.7 Asph. f/1.7
- Panasonic Leica D Summilux 25mm f/1.4 Asph. f/1.4
- Panasonic Leica DG Summilux 25mm f/1.4 Asph. f/1.4
- Panasonic Leica DG Summilux 25mm f/1.4 II f/1.4
- Voigtländer Nokton 25mm f/0.95 Type II f/0.9
- Sigma 30mm f/1.4 DC DN f/1.4
- Sigma 60mm f/2.8 DN f/2.8
Frequently asked questions#
Is the Panasonic G 20mm f/1.7 II Asph. full frame?
No — it is designed for Four Thirds sensors.
What is the Panasonic G 20mm f/1.7 II Asph. equivalent to on APS-C?
Its focal length is already the real value for Four Thirds: 20 mm frames like 40 mm on full frame.
What is the Panasonic G 20mm f/1.7 II Asph. good for?
As a standard prime it suits street, documentary, everyday and low-light shooting.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources