Focal lengths / Full frame
21mm on Full frame
Frames like 21mm on full frame: 81.2° across, 59.5° top to bottom.
A 21mm eq.
| A 21mm on Full frame | |
|---|---|
| Focal length | 21mm |
| Full-frame equivalent | 21mm |
| Horizontal | 81.2° |
| Vertical | 59.5° |
| Diagonal | 91.7° |
| Sensor | Full frame 36 × 24 mm |
| Crop factor | ×1 |
| Aspect ratio | 3:2 |
Same framing on other formats
The focal length that matches 21mm full-frame equivalent on each sensor size (crop-factor convention, diagonal).
| Sensor | Focal length | Closest page |
|---|---|---|
| Medium format | 26.6mm | 28mm on Medium format |
| APS-C | 14mm | 14mm on APS-C |
| APS-C (Canon) | 13.1mm | 12mm on APS-C (Canon) |
| Micro Four Thirds | 10.5mm | 10.5mm on Micro Four Thirds |
| 1-inch | 7.8mm | — |
Primes at 21mm for Full frame (18)
| Lens | Focal | Aperture | Mount | Year |
|---|---|---|---|---|
| Leica Super-APO-Summicron-SL 21mm f/2 ASPH. | 21mm | f/2 | L-Mount | 2023 |
| Leica Summilux-M 21mm f/1.4 ASPH. | 21mm | f/1.4 | Leica M | 2008 |
| Leica Super-Elmar-M 21mm f/3.4 ASPH. | 21mm | f/3.4 | Leica M | 2011 |
| Thypoch Simera 21mm f/1.4 (M) | 21mm | f/1.4 | Leica M | 2025 |
| TTArtisan 21mm f/1.5 (E) | 21mm | f/1.5 | Sony E | 2021 |
| TTArtisan 21mm f/1.5 (L) | 21mm | f/1.5 | L-Mount | 2021 |
| TTArtisan M 21mm f/1.5 (M) | 21mm | f/1.5 | Leica M | 2019 |
| TTArtisan 21mm f/1.5 (RF) | 21mm | f/1.5 | Canon RF | 2021 |
| TTArtisan 21mm f/1.5 (Z) | 21mm | f/1.5 | Nikon Z | 2021 |
| Voigtländer Nokton 21mm f/1.4 Aspherical (E) | 21mm | f/1.4 | Sony E | 2019 |
| Voigtländer Color-Skopar 21mm f/3.5 Aspherical (E) | 21mm | f/3.5 | Sony E | 2018 |
| Voigtländer Color-Skopar 21mm f/4 P VM | 21mm | f/4 | Leica M | 2007 |
| Voigtländer Color-Skopar Vintage Line 21mm f/3.5 Aspherical VM | 21mm | f/3.5 | Leica M | 2019 |
| Voigtländer Nokton 21mm f/1.4 Aspherical VM | 21mm | f/1.4 | Leica M | 2020 |
| Voigtländer Ultron 21mm f/1.8 Aspherical VM | 21mm | f/1.8 | Leica M | 2012 |
| Zeiss Loxia 21mm f/2.8 | 21mm | f/2.8 | Sony E | 2015 |
| Zeiss Biogon 21mm f/2.8 ZM | 21mm | f/2.8 | Leica M | 2004 |
| Zeiss C Biogon 21mm f/4.5 ZM | 21mm | f/4.5 | Leica M | 2006 |
Zooms that reach 21mm (42)
| Lens | Focal | Aperture | Mount | Year |
|---|---|---|---|---|
| Canon RF 14-35mm f/4L IS USM | 14–35mm | f/4 | Canon RF | 2021 |
| Canon RF 15-30mm f/4.5-6.3 IS STM | 15–30mm | f/4.5–6.3 | Canon RF | 2022 |
| Canon RF 15-35mm f/2.8L IS USM | 15–35mm | f/2.8 | Canon RF | 2019 |
| Canon RF 16-28mm f/2.8 IS STM | 16–28mm | f/2.8 | Canon RF | 2025 |
| Canon RF 20-50mm f/4L IS USM PZ | 20–50mm | f/4 | Canon RF | 2026 |
| Laowa 12-24mm f/5.6 Zoom (E) | 12–24mm | f/5.6 | Sony E | 2022 |
| Laowa 12-24mm f/5.6 Zoom (M) | 12–24mm | f/5.6 | Leica M | 2022 |
| Laowa 12-24mm f/5.6 Zoom (RF) | 12–24mm | f/5.6 | Canon RF | 2022 |
| Laowa 12-24mm f/5.6 Zoom (Z) | 12–24mm | f/5.6 | Nikon Z | 2022 |
| Leica Super-Vario-Elmarit-SL 14-24mm f/2.8 ASPH. | 14–24mm | f/2.8 | L-Mount | 2023 |
| Leica Super-Vario-Elmar-SL 16-35mm f/3.5-4.5 ASPH. | 16–35mm | f/3.5–4.5 | L-Mount | 2018 |
| Leica Tri-Elmar-M 16-21mm f/4 ASPH. | 16–21mm | f/4 | Leica M | 2006 |
| Nikon Z 14-24mm f/2.8 S | 14–24mm | f/2.8 | Nikon Z | 2020 |
| Nikon Z 14-30mm f/4 S | 14–30mm | f/4 | Nikon Z | 2019 |
| Nikon Z 17-28mm f/2.8 | 17–28mm | f/2.8 | Nikon Z | 2022 |
| Panasonic Lumix S 14-28mm f/4-5.6 Macro | 14–28mm | f/4–5.6 | L-Mount | 2023 |
| Panasonic Lumix S Pro 16-35mm f/4 | 16–35mm | f/4 | L-Mount | 2019 |
| Panasonic Lumix S 18-40mm f/4.5-6.3 | 18–40mm | f/4.5–6.3 | L-Mount | 2024 |
| Panasonic Lumix S 20-60mm f/3.5-5.6 | 20–60mm | f/3.5–5.6 | L-Mount | 2020 |
| Samyang AF 14-24mm f/2.8 FE | 14–24mm | f/2.8 | Sony E | 2025 |
| Samyang AF 14-24mm f/2.8 L | 14–24mm | f/2.8 | L-Mount | 2026 |
| Sigma 16-28mm f/2.8 DG DN | C (E) | 16–28mm | f/2.8 | Sony E | 2022 |
| Sigma 20-60mm f/2.8-4 DG | C (E) | 20–60mm | f/2.8–4 | Sony E | 2026 |
| Sigma 20-200mm f/3.5-6.3 DG | C (E) | 20–200mm | f/3.5–6.3 | Sony E | 2025 |
| Sigma 14-24mm f/2.8 DG DN | A (L) | 14–24mm | f/2.8 | L-Mount | 2019 |
| Sigma 16-28mm f/2.8 DG DN | C (L) | 16–28mm | f/2.8 | L-Mount | 2022 |
| Sigma 20-60mm f/2.8-4 DG | C (L) | 20–60mm | f/2.8–4 | L-Mount | 2026 |
| Sigma 20-200mm f/3.5-6.3 DG | C (L) | 20–200mm | f/3.5–6.3 | L-Mount | 2025 |
| Sony FE 12-24mm f/2.8 GM | 12–24mm | f/2.8 | Sony E | 2020 |
| Sony FE 12-24mm f/4 G | 12–24mm | f/4 | Sony E | 2017 |
| Sony FE 16-25mm f/2.8 G | 16–25mm | f/2.8 | Sony E | 2024 |
| Sony FE 16-35mm f/2.8 GM | 16–35mm | f/2.8 | Sony E | 2017 |
| Sony FE 16-35mm f/2.8 GM II | 16–35mm | f/2.8 | Sony E | 2023 |
| Sony Vario-Tessar T* FE 16-35mm f/4 ZA OSS | 16–35mm | f/4 | Sony E | 2014 |
| Sony FE PZ 16-35mm f/4 G | 16–35mm | f/4 | Sony E | 2022 |
| Sony FE 20-70mm f/4 G | 20–70mm | f/4 | Sony E | 2023 |
| Tamron 16-30mm f/2.8 Di III VXD G2 (E) | 16–30mm | f/2.8 | Sony E | 2025 |
| Tamron 17-28mm f/2.8 Di III RXD (E) | 17–28mm | f/2.8 | Sony E | 2019 |
| Tamron 17-50mm f/4 Di III VXD (E) | 17–50mm | f/4 | Sony E | 2023 |
| Tamron 20-40mm f/2.8 Di III VXD (E) | 20–40mm | f/2.8 | Sony E | 2022 |
| Tamron 16-30mm f/2.8 Di III VXD G2 (Z) | 16–30mm | f/2.8 | Nikon Z | 2025 |
| Tamron 20-40mm f/2.8 Di III VXD (Z) | 20–40mm | f/2.8 | Nikon Z | 2026 |