焦点距離 / フルサイズ
フルサイズで20mm
フルサイズの20mmと同じ画角。水平84°、垂直61.9°。
A 換算20mm
| A フルサイズで20mm | |
|---|---|
| 焦点距離 | 20mm |
| 35mm判換算 | 20mm |
| 水平 | 84° |
| 垂直 | 61.9° |
| 対角 | 94.5° |
| センサー | フルサイズ 36 × 24 mm |
| クロップ係数 | ×1 |
| アスペクト比 | 3:2 |
ほかのフォーマットで同じ画角
各センサーサイズで35mm判換算20mmに相当する焦点距離（クロップ係数による対角換算）。
| センサー | 焦点距離 | 近いページ |
|---|---|---|
| 中判 | 25.3mm | 中判で25mm |
| APS-C | 13.3mm | APS-Cで13mm |
| APS-C（キヤノン） | 12.5mm | APS-C（キヤノン）で12mm |
| マイクロフォーサーズ | 10mm | マイクロフォーサーズで10mm |
| 1型 | 7.4mm | — |
フルサイズ用の20mm単焦点（26本）
| レンズ | 焦点距離 | 開放F値 | マウント | 発表年 |
|---|---|---|---|---|
| Canon RF 20mm f/1.4L VCM | 20mm | f/1.4 | Canon RF | 2025 |
| Laowa 20mm f/4 Zero-D Shift (E) | 20mm | f/4 | Sony E | 2022 |
| Laowa 20mm f/4 Zero-D Shift (GFX) | 20mm | f/4 | Fujifilm G | 2022 |
| Laowa 20mm f/4 Zero-D Shift (L) | 20mm | f/4 | L-Mount | 2022 |
| Laowa 20mm f/4 Zero-D Shift (RF) | 20mm | f/4 | Canon RF | 2022 |
| Laowa 20mm f/4 Zero-D Shift (XCD) | 20mm | f/4 | Hasselblad XCD | 2022 |
| Laowa 20mm f/4 Zero-D Shift (Z) | 20mm | f/4 | Nikon Z | 2022 |
| Nikon Z 20mm f/1.8 S | 20mm | f/1.8 | Nikon Z | 2020 |
| Panasonic Lumix S 20mm f/2.5 | 20mm | f/2.5 | L-Mount | 2026 |
| Samyang 20mm f/1.8 ED AS UMC (E) | 20mm | f/1.8 | Sony E | 2016 |
| Samyang 20mm f/1.8 ED AS UMC (EF-M) | 20mm | f/1.8 | Canon EF-M | 2016 |
| Samyang 20mm f/1.8 ED AS UMC (MFT) | 20mm | f/1.8 | Micro Four Thirds | 2016 |
| Samyang 20mm f/1.8 ED AS UMC (X) | 20mm | f/1.8 | Fujifilm X | 2016 |
| Sigma 20mm f/2 DG DN | C (E) | 20mm | f/2 | Sony E | 2022 |
| Sigma 20mm f/2 DG DN | C (L) | 20mm | f/2 | L-Mount | 2022 |
| Sigma 20mm f/1.4 DG DN | A (L) | 20mm | f/1.4 | L-Mount | 2022 |
| Sigma 20mm f/1.4 DG HSM | A (L) | 20mm | f/1.4 | L-Mount | 2019 |
| Sony FE 20mm f/1.8 G | 20mm | f/1.8 | Sony E | 2020 |
| Tamron 20mm f/2.8 Di III OSD M1:2 (E) | 20mm | f/2.8 | Sony E | 2019 |
| Tokina FíRIN 20mm f/2 FE MF | 20mm | f/2 | Sony E | 2016 |
| Tokina FíRIN 20mm f/2 FE AF | 20mm | f/2 | Sony E | 2018 |
| Viltrox AF 20mm f/2.8 Air (E) | 20mm | f/2.8 | Sony E | 2023 |
| Viltrox MF 20mm f/1.8 (E) | 20mm | f/1.8 | Sony E | 2018 |
| Viltrox AF 20mm f/2.8 Air (L) | 20mm | f/2.8 | L-Mount | 2026 |
| Viltrox AF 20mm f/2.8 Air (Z) | 20mm | f/2.8 | Nikon Z | 2024 |
| Viltrox MF 20mm f/1.8 (Z) | 20mm | f/1.8 | Nikon Z | 2019 |
20mmを含むズーム（45本）
| レンズ | 焦点距離 | 開放F値 | マウント | 発表年 |
|---|---|---|---|---|
| Canon RF 10-20mm f/4L IS STM | 10–20mm | f/4 | Canon RF | 2023 |
| 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 12-20mm f/2.8 (E) | 12–20mm | f/2.8 | Sony E | 2026 |
| 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 12-20mm f/2.8 (Z) | 12–20mm | f/2.8 | Nikon Z | 2026 |
| 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 |