Specifications#
- Brand
- Phase One
- Model
- IQ140
- Camera type
- Medium-format digital
- Lens mount
- Mamiya 645
- Sensor size
- 43.9 × 32.9 mm (Medium format 44 × 33 mm)
- Crop factor
- 0.79×
Specifications merged from Wikidata, Lensfun and openMVG. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 0.79 to get the full-frame field of view. Angles are for a rectilinear lens focused at infinity.
| Lens on this camera | Full-frame equivalent | Horizontal | Vertical | Diagonal |
|---|---|---|---|---|
| 21 mm | 17 mm | 92.5° | 76.1° | 105.1° |
| 23 mm | 18 mm | 87.3° | 71.1° | 100.0° |
| 28 mm | 22 mm | 76.2° | 60.8° | 88.8° |
| 32 mm | 25 mm | 68.9° | 54.4° | 81.2° |
| 35 mm | 28 mm | 64.2° | 50.3° | 76.1° |
| 45 mm | 36 mm | 52.0° | 40.1° | 62.7° |
| 55 mm | 43 mm | 43.5° | 33.3° | 53.0° |
| 63 mm | 50 mm | 38.4° | 29.2° | 47.0° |
| 80 mm | 63 mm | 30.7° | 23.2° | 37.8° |
| 90 mm | 71 mm | 27.4° | 20.7° | 33.9° |
| 110 mm | 87 mm | 22.6° | 17.0° | 28.0° |
| 120 mm | 95 mm | 20.7° | 15.6° | 25.7° |
| 150 mm | 118 mm | 16.7° | 12.5° | 20.7° |
| 180 mm | 142 mm | 13.9° | 10.4° | 17.3° |
| 250 mm | 197 mm | 10.0° | 7.5° | 12.5° |
| 350 mm | 276 mm | 7.2° | 5.4° | 9.0° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 38.0 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 |
|---|---|---|---|---|---|---|---|---|
| 28 mm | f/1.8 | 4.1 cm | 17.1 cm | 71.0 cm | 1.67 m | 5.35 m | 71.9 m | 11.5 m |
| 28 mm | f/2.8 | 6.4 cm | 26.9 cm | 1.15 m | 2.89 m | 12.4 m | ∞ | 7.39 m |
| 28 mm | f/4 | 9.2 cm | 39.1 cm | 1.79 m | 5.18 m | 138 m | ∞ | 5.18 m |
| 28 mm | f/8 | 18.9 cm | 87.9 cm | 7.38 m | ∞ | ∞ | ∞ | 2.61 m |
| 55 mm | f/1.8 | 1.0 cm | 4.3 cm | 17.6 cm | 40.2 cm | 1.13 m | 4.74 m | 44.3 m |
| 55 mm | f/2.8 | 1.6 cm | 6.7 cm | 27.5 cm | 62.9 cm | 1.79 m | 7.98 m | 28.5 m |
| 55 mm | f/4 | 2.2 cm | 9.5 cm | 39.5 cm | 90.8 cm | 2.65 m | 13.3 m | 19.9 m |
| 55 mm | f/8 | 4.5 cm | 19.2 cm | 81.3 cm | 1.95 m | 6.61 m | ∞ | 10.00 m |
| 94 mm | f/1.8 | 0.3 cm | 1.4 cm | 5.9 cm | 13.5 cm | 38.1 cm | 1.54 m | 129 m |
| 94 mm | f/2.8 | 0.5 cm | 2.2 cm | 9.2 cm | 21.0 cm | 59.3 cm | 2.42 m | 83.1 m |
| 94 mm | f/4 | 0.7 cm | 3.1 cm | 13.1 cm | 30.1 cm | 85.0 cm | 3.51 m | 58.2 m |
| 94 mm | f/8 | 1.4 cm | 6.2 cm | 26.4 cm | 60.6 cm | 1.74 m | 7.72 m | 29.1 m |
| 154 mm | f/1.8 | 0.1 cm | 0.5 cm | 2.1 cm | 4.9 cm | 14.0 cm | 56.9 cm | 347 m |
| 154 mm | f/2.8 | 0.2 cm | 0.8 cm | 3.3 cm | 7.7 cm | 21.8 cm | 88.6 cm | 223 m |
| 154 mm | f/4 | 0.2 cm | 1.1 cm | 4.7 cm | 11.0 cm | 31.1 cm | 1.27 m | 156 m |
| 154 mm | f/8 | 0.4 cm | 2.2 cm | 9.5 cm | 21.9 cm | 62.4 cm | 2.57 m | 78.1 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 |
|---|---|
| 18 mm (14 mm eq.) | 35.2 s |
| 25 mm (20 mm eq.) | 25.3 s |
| 30 mm (24 mm eq.) | 21.1 s |
| 44 mm (35 mm eq.) | 14.4 s |
| 63 mm (50 mm eq.) | 10.1 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 |
|---|---|---|---|
| 30 mm | 1/25 s | 0.3 s | 1.3 s |
| 63 mm | 1/50 s | 1/6 s | 0.6 s |
| 127 mm | 1/100 s | 1/13 s | 0.3 s |
| 253 mm | 1/200 s | 1/25 s | 1/6 s |
Similar cameras#
Other Medium format 44 × 33 mm cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Phase One IQ140?
The Phase One IQ140 has a crop factor of 0.79× relative to 35 mm full frame (diagonal 54.8 mm vs 43.3 mm).
What size is the Phase One IQ140 sensor?
43.9 × 32.9 mm (Medium format 44 × 33 mm), an area of 1443 mm² — 167% of full frame.
Is the Phase One IQ140 full frame?
No — its sensor is larger than full frame (medium format).
What lens mount does the Phase One IQ140 use?
The Phase One IQ140 uses the Mamiya 645 (flange distance 63.30 mm).
How long can I expose the night sky with the Phase One IQ140?
With a 25 mm lens (20 mm equivalent) the 500 rule gives 25 s.
Sources & licences#
- Wikidata Q140487296 — CC0
- Lensfun camera database — CC BY-SA 3.0
- openMVG sensor width database — MPL-2.0
Last updated October 03, 2026 · How we calculate · Sources