Canon EOS R50 crop factor: 1.61×
The EOS R50 is Canon’s compact entry-level mirrorless camera — and, like every Canon APS-C body, it has a 1.6× crop factor rather than the 1.5× of Sony, Nikon and Fujifilm. Its 22.3 × 14.9 mm sensor has a 26.82 mm diagonal, so lenses frame 1.61× tighter than on full frame.
A 50 mm lens on Canon APS-C (1.61× crop) frames like a 81 mm lens on full frame. At f/1.8 it gives the depth of field of about f/2.9 there — but exposure stays the same as f/1.8.
- Horizontal field of view
- 25.1°
- Vertical field of view
- 16.9°
- Crop ratio
- 1.61×
- Sensor size
- 22.3 × 14.9 mm
Full-frame equivalent of a 50 mm f/1.8 lens on each format
| Sensor | Focal length | Aperture (DoF) |
|---|---|---|
| Full frame | 50 mm | f/1.8 |
| APS-C (1.5×) | 77 mm | f/2.8 |
| Canon APS-C (1.6×) | 81 mm | f/2.9 |
| Micro Four Thirds | 100 mm | f/3.6 |
| 1-inch | 137 mm | f/4.9 |
| Medium format (44×33) | 40 mm | f/1.4 |
| Phone main camera (1/1.3″) | 176 mm | f/6.3 |
Sensor size and crop factor
Crop factor is the full-frame diagonal (43.27 mm) divided by the sensor diagonal. For the EOS R50: √(22.3² + 14.9²) = 26.82 mm, and 43.27 ÷ 26.82 = 1.61.
| Property | Value |
|---|---|
| Sensor size | 22.3 × 14.9 mm |
| Diagonal | 26.82 mm |
| Crop factor (computed) | 1.61× |
| Crop factor quoted by the maker | 1.6× |
| Area vs full frame | 38% |
| Circle of confusion (diagonal ÷ 1443) | 0.019 mm |
| Resolution / pixel pitch | 24.2 MP · 3.71 µm |
| Lens mount | Canon RF |
Source: Canon specifications: approx. 22.3 × 14.9 mm (APS-C) CMOS sensor, approx. 24.2 effective megapixels.
Equivalent focal length and aperture for Canon RF lenses
The full-frame equivalent is the focal length × 1.61. The DoF-equivalent aperture (f-number × 1.61) describes depth of field and total light at the same framing; exposure — shutter speed and ISO — is set by the real f-number as usual. Hyperfocal distances use a 0.019 mm circle of confusion.
| Lens | Focal length | Full-frame equivalent | Max aperture | DoF-equivalent aperture | Horizontal view | Hyperfocal at f/8 |
|---|---|---|---|---|---|---|
| Canon RF-S 18–45mm F4.5–6.3 IS STM (kit)at 18 mm | 18 mm | 29.0 mm | f/4.5 | f/7.2 | 63.6° | 2.15 m7.05 ft |
| Canon RF-S 18–45mm F4.5–6.3 IS STM (kit)at 45 mm | 45 mm | 72.5 mm | f/6.3 | f/10.1 | 27.8° | 13.4 m43.9 ft |
| Canon RF-S 55–210mm F5–7.1 IS STMat 55 mm | 55 mm | 88.6 mm | f/5 | f/8.1 | 22.9° | 20.0 m65.5 ft |
| Canon RF-S 55–210mm F5–7.1 IS STMat 210 mm | 210 mm | 338 mm | f/7.1 | f/11.4 | 6.1° | 290 m953 ft |
| Canon RF-S 10–18mm F4.5–6.3 IS STMat 10 mm | 10 mm | 16.1 mm | f/4.5 | f/7.2 | 96.2° | 67 cm2.19 ft |
| Canon RF-S 10–18mm F4.5–6.3 IS STMat 18 mm | 18 mm | 29.0 mm | f/6.3 | f/10.1 | 63.6° | 2.15 m7.05 ft |
| Canon RF 16mm F2.8 STM | 16 mm | 25.8 mm | f/2.8 | f/4.5 | 69.7° | 1.70 m5.58 ft |
| Canon RF 28mm F2.8 STM | 28 mm | 45.1 mm | f/2.8 | f/4.5 | 43.4° | 5.19 m17.0 ft |
| Canon RF 50mm F1.8 STM | 50 mm | 80.5 mm | f/1.8 | f/2.9 | 25.1° | 16.5 m54.1 ft |
| Canon RF 85mm F2 Macro IS STM | 85 mm | 137 mm | f/2 | f/3.2 | 14.9° | 47.6 m156 ft |
What is different about the EOS R50
Canon’s APS-C sensors have always been slightly smaller than other brands’: 22.3 × 14.9 mm against about 23.5 × 15.6 mm. The diagonal is 26.8 mm, so the crop factor is 1.61×, and a lens frames about 5% tighter on an R50 than on a Sony or Fujifilm APS-C body. That is why a 50 mm lens on Canon is often described as an "80 mm portrait lens" while on Sony it is "75 mm".
The R50 has no in-body stabilisation, so the "IS" in RF-S lens names matters. Full-frame RF lenses fit and work normally: the RF 50mm F1.8 STM is the most popular first prime, giving an 80 mm field of view with the background blur of about f/2.9 on full frame. RF-S lenses designed for the 1.6× sensor are smaller and lighter, but they vignette heavily if you later move to a full-frame RF body.
FAQ
What is the crop factor of the Canon EOS R50?
1.61×. The 22.3 × 14.9 mm sensor has a 26.82 mm diagonal, and 43.27 ÷ 26.82 = 1.61. The maker rounds it to 1.6×.
What is the full-frame equivalent of the Canon RF-S 18–45mm F4.5–6.3 IS STM?
29–72 mm in field of view, with the depth of field of about f/7.2–f/10.1 on full frame. Exposure does not change: f/4.5 still needs the same shutter speed and ISO as f/4.5 on any camera.
What does the Canon RF 50mm F1.8 STM equal on full frame?
About 81 mm f/2.9: the field of view of a 81 mm lens and the depth of field of f/2.9 on full frame. Its hyperfocal distance at f/8 on the EOS R50 is 16.5 m (54.1 ft).
Why is Canon APS-C 1.6× and not 1.5×?
Because Canon uses a smaller sensor: about 22.3 × 14.9 mm (26.8 mm diagonal) against roughly 23.5 × 15.6 mm (28.2 mm) for Sony, Nikon and Fujifilm APS-C. 43.27 ÷ 26.8 = 1.61, while 43.27 ÷ 28.2 = 1.53. The R50, R10, R7 and R100 all share the 1.6× format.
Other cameras
- Sony a640023.5 × 15.6 mm · 1.53× crop
- Sony a670023.3 × 15.5 mm · 1.55× crop
- Sony ZV-E1023.5 × 15.6 mm · 1.53× crop
- Canon EOS R1022.3 × 14.9 mm · 1.61× crop
- Nikon Z5023.5 × 15.7 mm · 1.53× crop
- Fujifilm X-T523.5 × 15.6 mm · 1.53× crop
- Panasonic Lumix G9 II17.3 × 13 mm · 2.00× crop
- Sony RX100 series13.2 × 8.8 mm · 2.73× crop
- iPhone 17 Pro main camera≈ 10.0 × 7.5 mm · 3.46× crop
More on the Canon APS-C format — depth of field, hyperfocal and star charts — on the Canon APS-C (1.6×) sensor page. The theory is in crop factor explained.