Specifications#
- Brand
- Ricoh
- Model
- GR Digital IV
- Camera type
- Compact
- Released
- 2011-01-01
- Sensor size
- 7.6 × 5.7 mm (1/1.7" sensor)
- Crop factor
- 4.55×
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 4.55 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 | 18 mm | 87.1° | 70.9° | 99.8° |
| 4.5 mm | 20 mm | 80.4° | 64.7° | 93.1° |
| 5 mm | 23 mm | 74.5° | 59.4° | 87.1° |
| 6 mm | 27 mm | 64.7° | 50.8° | 76.7° |
| 8 mm | 36 mm | 50.8° | 39.2° | 61.4° |
| 10 mm | 46 mm | 41.6° | 31.8° | 50.8° |
| 12 mm | 55 mm | 35.1° | 26.7° | 43.2° |
| 15 mm | 68 mm | 28.4° | 21.5° | 35.1° |
| 20 mm | 91 mm | 21.5° | 16.2° | 26.7° |
| 25 mm | 114 mm | 17.3° | 13.0° | 21.5° |
| 30 mm | 137 mm | 14.4° | 10.9° | 18.0° |
| 40 mm | 182 mm | 10.9° | 8.2° | 13.5° |
| 50 mm | 228 mm | 8.7° | 6.5° | 10.9° |
| 70 mm | 319 mm | 6.2° | 4.7° | 7.8° |
| 100 mm | 455 mm | 4.4° | 3.3° | 5.4° |
| 150 mm | 683 mm | 2.9° | 2.2° | 3.6° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 6.6 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 |
|---|---|---|---|---|---|---|---|---|
| 5 mm | f/2 | 28.0 cm | 1.45 m | ∞ | ∞ | ∞ | ∞ | 1.90 m |
| 5 mm | f/2.8 | 42.1 cm | 3.18 m | ∞ | ∞ | ∞ | ∞ | 1.36 m |
| 5 mm | f/4 | 71.7 cm | ∞ | ∞ | ∞ | ∞ | ∞ | 95.4 cm |
| 5 mm | f/8 | ∞ | ∞ | ∞ | ∞ | ∞ | ∞ | 47.9 cm |
| 10 mm | f/2 | 6.5 cm | 26.5 cm | 1.13 m | 2.80 m | 11.6 m | ∞ | 7.60 m |
| 10 mm | f/2.8 | 9.1 cm | 37.8 cm | 1.70 m | 4.75 m | 60.2 m | ∞ | 5.43 m |
| 10 mm | f/4 | 13.1 cm | 56.0 cm | 2.89 m | 12.5 m | ∞ | ∞ | 3.81 m |
| 10 mm | f/8 | 27.7 cm | 1.43 m | ∞ | ∞ | ∞ | ∞ | 1.91 m |
| 17 mm | f/2 | 2.2 cm | 9.0 cm | 36.5 cm | 83.1 cm | 2.40 m | 11.5 m | 22.0 m |
| 17 mm | f/2.8 | 3.1 cm | 12.6 cm | 51.4 cm | 1.19 m | 3.54 m | 21.4 m | 15.7 m |
| 17 mm | f/4 | 4.4 cm | 18.1 cm | 74.8 cm | 1.76 m | 5.72 m | 106 m | 11.0 m |
| 17 mm | f/8 | 8.9 cm | 37.0 cm | 1.66 m | 4.63 m | 52.1 m | ∞ | 5.50 m |
| 28 mm | f/2 | 0.8 cm | 3.3 cm | 13.3 cm | 30.0 cm | 84.1 cm | 3.45 m | 59.5 m |
| 28 mm | f/2.8 | 1.1 cm | 4.6 cm | 18.6 cm | 42.2 cm | 1.19 m | 4.97 m | 42.5 m |
| 28 mm | f/4 | 1.6 cm | 6.5 cm | 26.6 cm | 60.5 cm | 1.72 m | 7.55 m | 29.8 m |
| 28 mm | f/8 | 3.2 cm | 13.1 cm | 54.0 cm | 1.25 m | 3.76 m | 24.3 m | 14.9 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 (18 mm eq.) | 27.4 s |
| 5 mm (23 mm eq.) | 22.0 s |
| 6 mm (27 mm eq.) | 18.3 s |
| 8 mm (36 mm eq.) | 13.7 s |
| 11 mm (50 mm eq.) | 10.0 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 |
|---|---|---|---|
| 5 mm | 1/25 s | 0.3 s | 1.3 s |
| 11 mm | 1/50 s | 1/6 s | 0.6 s |
| 22 mm | 1/100 s | 1/13 s | 0.3 s |
| 44 mm | 1/200 s | 1/25 s | 1/6 s |
Lens#
The Ricoh GR Digital IV 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 × 4.55.
Similar cameras#
Other 1/1.7" cameras from around the same time.
Frequently asked questions#
What is the crop factor of the Ricoh GR Digital IV?
The Ricoh GR Digital IV has a crop factor of 4.55× relative to 35 mm full frame (diagonal 9.5 mm vs 43.3 mm).
What size is the Ricoh GR Digital IV sensor?
7.6 × 5.7 mm (1/1.7"), an area of 43 mm² — 5% of full frame.
Is the Ricoh GR Digital IV full frame?
No — its sensor is 1/1.7", which is 19.9× smaller in area than full frame.
How long can I expose the night sky with the Ricoh GR Digital IV?
With a 5 mm lens (23 mm equivalent) the 500 rule gives 22 s.
Sources & licences#
- Wikidata Q20889210 — CC0
- openMVG sensor width database — MPL-2.0
Last updated October 03, 2026 · How we calculate · Sources