Specifications#
- Brand
- Kyocera
- Model
- Contax i4R
- Camera type
- Compact
- Sensor size
- 5.3 × 4.0 mm (1/2.5" sensor)
- Crop factor
- 6.49×
Specifications merged from Wikidata and openMVG. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 6.49 to get the full-frame field of view. For fixed-lens cameras use the real focal length printed on the lens (e.g. “6.1–18.3 mm”), not the 35 mm equivalent.
| Lens on this camera | Full-frame equivalent | Horizontal | Vertical | Diagonal |
|---|---|---|---|---|
| 4 mm | 26 mm | 67.3° | 53.1° | 79.6° |
| 4.5 mm | 29 mm | 61.3° | 47.9° | 73.0° |
| 5 mm | 32 mm | 56.1° | 43.6° | 67.4° |
| 6 mm | 39 mm | 47.9° | 36.9° | 58.1° |
| 8 mm | 52 mm | 36.8° | 28.1° | 45.2° |
| 10 mm | 65 mm | 29.8° | 22.6° | 36.9° |
| 12 mm | 78 mm | 25.0° | 18.9° | 31.0° |
| 15 mm | 97 mm | 20.1° | 15.2° | 25.0° |
| 20 mm | 130 mm | 15.2° | 11.4° | 18.9° |
| 25 mm | 162 mm | 12.2° | 9.1° | 15.2° |
| 30 mm | 195 mm | 10.2° | 7.6° | 12.7° |
| 40 mm | 260 mm | 7.6° | 5.7° | 9.5° |
| 50 mm | 325 mm | 6.1° | 4.6° | 7.6° |
| 70 mm | 454 mm | 4.4° | 3.3° | 5.5° |
| 100 mm | 649 mm | 3.1° | 2.3° | 3.8° |
| 150 mm | 974 mm | 2.0° | 1.5° | 2.5° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 4.6 µm (the 0.030 mm full-frame standard scaled by the crop factor).
| Focal | Aperture | 50.0 cm | 1.00 m | 2.00 m | 3.00 m | 5.00 m | 10.0 m | Hyperfocal |
|---|---|---|---|---|---|---|---|---|
| 4 mm | f/2 | 31.2 cm | 1.72 m | ∞ | ∞ | ∞ | ∞ | 1.74 m |
| 4 mm | f/2.8 | 47.8 cm | 4.58 m | ∞ | ∞ | ∞ | ∞ | 1.24 m |
| 4 mm | f/4 | 85.3 cm | ∞ | ∞ | ∞ | ∞ | ∞ | 87.0 cm |
| 4 mm | f/8 | ∞ | ∞ | ∞ | ∞ | ∞ | ∞ | 43.7 cm |
| 7 mm | f/2 | 9.4 cm | 38.8 cm | 1.75 m | 4.97 m | 83.1 m | ∞ | 5.31 m |
| 7 mm | f/2.8 | 13.2 cm | 56.3 cm | 2.91 m | 12.6 m | ∞ | ∞ | 3.79 m |
| 7 mm | f/4 | 19.3 cm | 87.1 cm | 6.91 m | ∞ | ∞ | ∞ | 2.66 m |
| 7 mm | f/8 | 43.2 cm | 3.41 m | ∞ | ∞ | ∞ | ∞ | 1.33 m |
| 12 mm | f/2 | 3.1 cm | 12.7 cm | 51.9 cm | 1.19 m | 3.57 m | 21.8 m | 15.6 m |
| 12 mm | f/2.8 | 4.4 cm | 17.9 cm | 73.8 cm | 1.74 m | 5.61 m | 92.2 m | 11.1 m |
| 12 mm | f/4 | 6.3 cm | 25.8 cm | 1.09 m | 2.70 m | 10.8 m | ∞ | 7.80 m |
| 12 mm | f/8 | 12.7 cm | 54.2 cm | 2.76 m | 11.2 m | ∞ | ∞ | 3.91 m |
| 20 mm | f/2 | 1.1 cm | 4.5 cm | 18.3 cm | 41.5 cm | 1.17 m | 4.87 m | 43.3 m |
| 20 mm | f/2.8 | 1.6 cm | 6.3 cm | 25.7 cm | 58.4 cm | 1.65 m | 7.21 m | 30.9 m |
| 20 mm | f/4 | 2.2 cm | 9.1 cm | 36.9 cm | 84.2 cm | 2.43 m | 11.7 m | 21.7 m |
| 20 mm | f/8 | 4.4 cm | 18.3 cm | 75.7 cm | 1.79 m | 5.84 m | 123 m | 10.8 m |
Equivalent aperture#
Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.
Night-sky exposure limits#
Longest exposure before stars trail. The NPF rule accounts for pixel pitch and is stricter than the classic 500 rule — use it for pin-sharp stars on high-resolution sensors. (NPF needs a known resolution and is omitted here.)
| Focal length | 500 rule |
|---|---|
| 4 mm (26 mm eq.) | 19.3 s |
| 5 mm (32 mm eq.) | 15.4 s |
| 6 mm (39 mm eq.) | 12.8 s |
| 7 mm (45 mm eq.) | 11.0 s |
| 8 mm (52 mm eq.) | 9.6 s |
Handheld shutter speed guide#
The reciprocal rule uses the equivalent focal length. High-resolution sensors may need one stop faster than this for pixel-sharp results.
| Focal length | No stabilisation (1/equiv. focal) | With 3-stop IS | With 5-stop IBIS |
|---|---|---|---|
| 4 mm | 1/25 s | 0.3 s | 1.3 s |
| 8 mm | 1/50 s | 1/6 s | 0.6 s |
| 15 mm | 1/100 s | 1/13 s | 0.3 s |
| 31 mm | 1/200 s | 1/25 s | 1/6 s |
Lens#
The Kyocera Contax i4R has a built-in, non-interchangeable lens. Use the real focal length of that lens with the tables above; its full-frame equivalent is that number × 6.49.
Similar cameras#
Other 1/2.5" cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Kyocera Contax i4R?
The Kyocera Contax i4R has a crop factor of 6.49× relative to 35 mm full frame (diagonal 6.7 mm vs 43.3 mm).
What size is the Kyocera Contax i4R sensor?
5.3 × 4.0 mm (1/2.5"), an area of 21 mm² — 2% of full frame.
Is the Kyocera Contax i4R full frame?
No — its sensor is 1/2.5", which is 40.5× smaller in area than full frame.
How long can I expose the night sky with the Kyocera Contax i4R?
With a 5 mm lens (32 mm equivalent) the 500 rule gives 15 s.
Sources & licences#
- Wikipedia: Contax i4R — CC BY-SA 4.0
- Wikidata Q5164924 — CC0
- openMVG sensor width database — MPL-2.0
Last updated October 03, 2026 · How we calculate · Sources