Specifications#
- Brand
- Casio
- Model
- Exilim EX-Z250
- Also known as
- EX-Z250
- Camera type
- Compact
- Sensor size
- 5.8 × 4.3 mm (1/2.5" sensor)
- Crop factor
- 6.02×
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 6.02 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 | 71.4° | 56.6° | 83.9° |
| 4.5 mm | 27 mm | 65.1° | 51.2° | 77.2° |
| 5 mm | 30 mm | 59.8° | 46.6° | 71.4° |
| 6 mm | 36 mm | 51.2° | 39.5° | 61.8° |
| 8 mm | 48 mm | 39.5° | 30.2° | 48.4° |
| 10 mm | 60 mm | 32.1° | 24.3° | 39.5° |
| 12 mm | 72 mm | 26.9° | 20.4° | 33.3° |
| 15 mm | 90 mm | 21.7° | 16.4° | 26.9° |
| 20 mm | 120 mm | 16.4° | 12.3° | 20.4° |
| 25 mm | 151 mm | 13.1° | 9.9° | 16.4° |
| 30 mm | 181 mm | 10.9° | 8.2° | 13.7° |
| 40 mm | 241 mm | 8.2° | 6.2° | 10.3° |
| 50 mm | 301 mm | 6.6° | 4.9° | 8.2° |
| 70 mm | 421 mm | 4.7° | 3.5° | 5.9° |
| 100 mm | 602 mm | 3.3° | 2.5° | 4.1° |
| 150 mm | 903 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 | 34.2 cm | 2.02 m | ∞ | ∞ | ∞ | ∞ | 1.61 m |
| 4 mm | f/2.8 | 53.2 cm | 7.07 m | ∞ | ∞ | ∞ | ∞ | 1.15 m |
| 4 mm | f/4 | 99.9 cm | ∞ | ∞ | ∞ | ∞ | ∞ | 80.7 cm |
| 4 mm | f/8 | ∞ | ∞ | ∞ | ∞ | ∞ | ∞ | 40.5 cm |
| 7 mm | f/2 | 10.1 cm | 42.1 cm | 1.94 m | 5.80 m | ∞ | ∞ | 4.92 m |
| 7 mm | f/2.8 | 14.3 cm | 61.5 cm | 3.35 m | 18.7 m | ∞ | ∞ | 3.52 m |
| 7 mm | f/4 | 20.9 cm | 96.5 cm | 9.46 m | ∞ | ∞ | ∞ | 2.47 m |
| 7 mm | f/8 | 47.8 cm | 4.65 m | ∞ | ∞ | ∞ | ∞ | 1.24 m |
| 12 mm | f/2 | 3.4 cm | 13.7 cm | 56.1 cm | 1.30 m | 3.92 m | 26.5 m | 14.5 m |
| 12 mm | f/2.8 | 4.7 cm | 19.3 cm | 80.0 cm | 1.90 m | 6.31 m | 304 m | 10.3 m |
| 12 mm | f/4 | 6.8 cm | 27.9 cm | 1.19 m | 2.99 m | 13.2 m | ∞ | 7.24 m |
| 12 mm | f/8 | 13.8 cm | 59.1 cm | 3.16 m | 15.7 m | ∞ | ∞ | 3.62 m |
| 20 mm | f/2 | 1.2 cm | 4.9 cm | 19.8 cm | 44.8 cm | 1.26 m | 5.30 m | 40.2 m |
| 20 mm | f/2.8 | 1.7 cm | 6.8 cm | 27.8 cm | 63.0 cm | 1.79 m | 7.92 m | 28.7 m |
| 20 mm | f/4 | 2.4 cm | 9.8 cm | 39.9 cm | 91.1 cm | 2.64 m | 13.2 m | 20.1 m |
| 20 mm | f/8 | 4.8 cm | 19.7 cm | 82.1 cm | 1.95 m | 6.58 m | 1.8 km | 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.) | 20.8 s |
| 5 mm (30 mm eq.) | 16.6 s |
| 6 mm (36 mm eq.) | 13.8 s |
| 7 mm (42 mm eq.) | 11.9 s |
| 8 mm (48 mm eq.) | 10.4 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 Exilim EX-Z250 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 × 6.02.
Similar cameras#
Other 1/2.5" cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Casio Exilim EX-Z250?
The Casio Exilim EX-Z250 has a crop factor of 6.02× relative to 35 mm full frame (diagonal 7.2 mm vs 43.3 mm).
What size is the Casio Exilim EX-Z250 sensor?
5.8 × 4.3 mm (1/2.5"), an area of 25 mm² — 3% of full frame.
Is the Casio Exilim EX-Z250 full frame?
No — its sensor is 1/2.5", which is 34.9× smaller in area than full frame.
How long can I expose the night sky with the Casio Exilim EX-Z250?
With a 5 mm lens (30 mm equivalent) the 500 rule gives 17 s.
Sources & licences#
- Wikidata Q140487654 — CC0
- openMVG sensor width database — MPL-2.0
Last updated October 03, 2026 · How we calculate · Sources