Specifications#
- Brand
- Casio
- Model
- EX-Z4
- Camera type
- Compact
- Sensor size
- 5.7 × 4.3 mm (1/2.5" sensor)
- Crop factor
- 6.05×
Specifications merged from Lensfun. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 6.05 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 | 24 mm | 71.1° | 56.4° | 83.6° |
| 4.5 mm | 27 mm | 64.9° | 51.0° | 76.9° |
| 5 mm | 30 mm | 59.5° | 46.4° | 71.1° |
| 6 mm | 36 mm | 51.0° | 39.3° | 61.6° |
| 8 mm | 48 mm | 39.3° | 30.0° | 48.2° |
| 10 mm | 61 mm | 31.9° | 24.2° | 39.3° |
| 12 mm | 73 mm | 26.8° | 20.3° | 33.2° |
| 15 mm | 91 mm | 21.6° | 16.3° | 26.8° |
| 20 mm | 121 mm | 16.3° | 12.2° | 20.3° |
| 25 mm | 151 mm | 13.1° | 9.8° | 16.3° |
| 30 mm | 182 mm | 10.9° | 8.2° | 13.6° |
| 40 mm | 242 mm | 8.2° | 6.1° | 10.2° |
| 50 mm | 303 mm | 6.5° | 4.9° | 8.2° |
| 70 mm | 424 mm | 4.7° | 3.5° | 5.8° |
| 100 mm | 605 mm | 3.3° | 2.5° | 4.1° |
| 150 mm | 908 mm | 2.2° | 1.6° | 2.7° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 5.0 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 | 33.9 cm | 1.99 m | ∞ | ∞ | ∞ | ∞ | 1.62 m |
| 4 mm | f/2.8 | 52.8 cm | 6.82 m | ∞ | ∞ | ∞ | ∞ | 1.16 m |
| 4 mm | f/4 | 98.8 cm | ∞ | ∞ | ∞ | ∞ | ∞ | 81.1 cm |
| 4 mm | f/8 | ∞ | ∞ | ∞ | ∞ | ∞ | ∞ | 40.7 cm |
| 7 mm | f/2 | 10.1 cm | 41.9 cm | 1.93 m | 5.74 m | ∞ | ∞ | 4.95 m |
| 7 mm | f/2.8 | 14.2 cm | 61.1 cm | 3.32 m | 18.1 m | ∞ | ∞ | 3.54 m |
| 7 mm | f/4 | 20.8 cm | 95.9 cm | 9.23 m | ∞ | ∞ | ∞ | 2.48 m |
| 7 mm | f/8 | 47.5 cm | 4.54 m | ∞ | ∞ | ∞ | ∞ | 1.24 m |
| 12 mm | f/2 | 3.4 cm | 13.7 cm | 55.8 cm | 1.29 m | 3.89 m | 26.1 m | 14.5 m |
| 12 mm | f/2.8 | 4.7 cm | 19.2 cm | 79.6 cm | 1.88 m | 6.25 m | 264 m | 10.4 m |
| 12 mm | f/4 | 6.8 cm | 27.7 cm | 1.18 m | 2.97 m | 13.0 m | ∞ | 7.27 m |
| 12 mm | f/8 | 13.7 cm | 58.8 cm | 3.13 m | 15.3 m | ∞ | ∞ | 3.64 m |
| 20 mm | f/2 | 1.2 cm | 4.9 cm | 19.7 cm | 44.6 cm | 1.25 m | 5.27 m | 40.4 m |
| 20 mm | f/2.8 | 1.7 cm | 6.8 cm | 27.6 cm | 62.7 cm | 1.78 m | 7.87 m | 28.8 m |
| 20 mm | f/4 | 2.4 cm | 9.7 cm | 39.6 cm | 90.6 cm | 2.63 m | 13.1 m | 20.2 m |
| 20 mm | f/8 | 4.8 cm | 19.6 cm | 81.7 cm | 1.94 m | 6.53 m | 951 m | 10.1 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 (24 mm eq.) | 20.7 s |
| 5 mm (30 mm eq.) | 16.5 s |
| 6 mm (36 mm eq.) | 13.8 s |
| 7 mm (42 mm eq.) | 11.8 s |
| 8 mm (48 mm eq.) | 10.3 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 |
| 17 mm | 1/100 s | 1/13 s | 0.3 s |
| 33 mm | 1/200 s | 1/25 s | 1/6 s |
Lens#
The Casio EX-Z4 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 × 6.05.
Similar cameras#
Other 1/2.5" cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Casio EX-Z4?
The Casio EX-Z4 has a crop factor of 6.05× relative to 35 mm full frame (diagonal 7.1 mm vs 43.3 mm).
What size is the Casio EX-Z4 sensor?
5.7 × 4.3 mm (1/2.5"), an area of 25 mm² — 3% of full frame.
Is the Casio EX-Z4 full frame?
No — its sensor is 1/2.5", which is 35.2× smaller in area than full frame.
How long can I expose the night sky with the Casio EX-Z4?
With a 5 mm lens (30 mm equivalent) the 500 rule gives 17 s.
Sources & licences#
- Lensfun camera database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources