Field of View

Focal lengths / APS-C

17mm on APS-C

Frames like 25.5mm on full frame: 69.3° across, 49.3° top to bottom.

Reference photo: Forest
A 25.5mm eq.
The scene as framed by 17mm APS-C
A What 17mm APS-C sees
A 17mm on APS-C
Focal length17mm
Full-frame equivalent25.5mm
Horizontal69.3°
Vertical49.3°
Diagonal79.4°
SensorAPS-C 23.5 × 15.6 mm
Crop factor×1.5
Aspect ratio3:2

Compare it with another setup →

Same framing on other formats

The focal length that matches 25.5mm full-frame equivalent on each sensor size (crop-factor convention, diagonal).

SensorFocal lengthClosest page
Medium format32.3mm30mm on Medium format
Full frame25.5mm25mm on Full frame
APS-C (Canon)15.9mm16mm on APS-C (Canon)
Micro Four Thirds12.8mm12mm on Micro Four Thirds
1-inch9.4mm10mm on 1-inch

Primes at 17mm for APS-C (8)

LensFocalApertureMountYear
TTArtisan AF 17mm f/1.8 Air (E)17mmf/1.8Sony E2026
TTArtisan APS-C 17mm f/1.4 (E)17mmf/1.4Sony E2021
TTArtisan APS-C 17mm f/1.4 (L)17mmf/1.4L-Mount2021
TTArtisan APS-C 17mm f/1.4 (MFT)17mmf/1.4Micro Four Thirds2021
TTArtisan AF 17mm f/1.8 Air (X)17mmf/1.8Fujifilm X2026
TTArtisan APS-C 17mm f/1.4 (X)17mmf/1.4Fujifilm X2021
TTArtisan AF 17mm f/1.8 Air (Z)17mmf/1.8Nikon Z2026
TTArtisan APS-C 17mm f/1.4 (Z)17mmf/1.4Nikon Z2021
Zooms that reach 17mm (43)
LensFocalApertureMountYear
Fujifilm XF 10-24mm f/4 R OIS10–24mmf/4Fujifilm X2013
Fujifilm XF 10-24mm f/4 R OIS WR10–24mmf/4Fujifilm X2020
Fujifilm XC 13-33mm f/3.5-6.3 OIS13–33mmf/3.5–6.3Fujifilm X2025
Fujifilm XC 15-45mm f/3.5-5.6 OIS PZ15–45mmf/3.5–5.6Fujifilm X2018
Fujifilm XF 16-50mm f/2.8-4.8 R LM WR16–50mmf/2.8–4.8Fujifilm X2024
Fujifilm XF 16-55mm f/2.8 R LM WR16–55mmf/2.8Fujifilm X2015
Fujifilm XF 16-55mm f/2.8 R LM WR II16–55mmf/2.8Fujifilm X2024
Fujifilm XF 16-80mm f/4 R OIS WR16–80mmf/4Fujifilm X2019
Fujifilm XC 16-50mm f/3.5-5.6 OIS II16–50mmf/3.5–5.6Fujifilm X2015
Laowa 12-24mm f/5.6 Zoom Shift CF (E)12–24mmf/5.6Sony E2024
Laowa 12-24mm f/5.6 Zoom Shift CF (L)12–24mmf/5.6L-Mount2024
Laowa 12-24mm f/5.6 Zoom Shift CF (X)12–24mmf/5.6Fujifilm X2024
Laowa 12-24mm f/5.6 Zoom Shift CF (Z)12–24mmf/5.6Nikon Z2024
Leica Super-Vario-Elmar-TL 11-23mm f/3.5-4.5 ASPH.11–23mmf/3.5–4.5L-Mount2014
Nikon Z DX 12-28mm f/3.5-5.6 PZ VR12–28mmf/3.5–5.6Nikon Z2023
Nikon Z DX 16-50mm f/3.5-6.3 VR16–50mmf/3.5–6.3Nikon Z2019
Nikon Z DX 16-50mm f/2.8 VR16–50mmf/2.8Nikon Z2025
Sigma 10-18mm f/2.8 DC DN | C (E)10–18mmf/2.8Sony E2023
Sigma 16-300mm f/3.5-6.7 DC OS | C (E)16–300mmf/3.5–6.7Sony E2025
Sigma 17-40mm f/1.8 DC | A (E)17–40mmf/1.8Sony E2025
Sigma 10-18mm f/2.8 DC DN | C (L)10–18mmf/2.8L-Mount2023
Sigma 16-300mm f/3.5-6.7 DC OS | C (L)16–300mmf/3.5–6.7L-Mount2025
Sigma 17-40mm f/1.8 DC | A (L)17–40mmf/1.8L-Mount2025
Sigma 10-18mm f/2.8 DC DN | C (X)10–18mmf/2.8Fujifilm X2023
Sigma 16-300mm f/3.5-6.7 DC OS | C (X)16–300mmf/3.5–6.7Fujifilm X2025
Sigma 17-40mm f/1.8 DC | A (X)17–40mmf/1.8Fujifilm X2025
Sigma 16-300mm f/3.5-6.7 DC OS | C (Z)16–300mmf/3.5–6.7Nikon Z2026
Sony E 10-18mm f/4 OSS10–18mmf/4Sony E2012
Sony E PZ 10-20mm f/4 G10–20mmf/4Sony E2022
Sony E PZ 16-50mm f/3.5-5.6 OSS II16–50mmf/3.5–5.6Sony E2024
Sony E PZ 16-50mm f/3.5-5.6 OSS16–50mmf/3.5–5.6Sony E2012
Sony E 16-55mm f/2.8 G16–55mmf/2.8Sony E2019
Sony Vario-Tessar T* E 16-70mm f/4 ZA OSS16–70mmf/4Sony E2013
Tamron 11-20mm f/2.8 Di III-A RXD (E)11–20mmf/2.8Sony E2021
Tamron 16-50mm f/2.8 A (E)16–50mmf/2.8Sony E2026
Tamron 17-70mm f/2.8 Di III-A VC RXD (E)17–70mmf/2.8Sony E2020
Tamron 11-20mm f/2.8 Di III-A RXD (X)11–20mmf/2.8Fujifilm X2023
Tamron 16-50mm f/2.8 A (X)16–50mmf/2.8Fujifilm X2026
Tamron 17-70mm f/2.8 Di III-A VC RXD (X)17–70mmf/2.8Fujifilm X2022
Tamron 16-50mm f/2.8 A (Z)16–50mmf/2.8Nikon Z2026
Tamron 17-70mm f/2.8 Di III-A VC RXD (Z)17–70mmf/2.8Nikon Z2026
Tokina atx-m 11-18mm f/2.8 E11–18mmf/2.8Sony E2022
Tokina atx-m 11-18mm f/2.8 X11–18mmf/2.8Fujifilm X2025