Specifications#
- Brand
- Ricoh
- Model
- GR Digital
- Camera type
- Compact
- Released
- 2005-01-01
- Sensor size
- 7.1 × 5.5 mm (1/1.7" sensor)
- Crop factor
- 4.80×
- Resolution
- 8.1 MP (3,264 × 2,448 px)
- Weight
- 200 g (7.1 oz)
- Sensor
- 1/1.8" CCD (8.1 Megapixels)
- Storage
- SD card, 26 MB internal memory
- Viewfinder
- External via hotshoe
- Metering
- 256 multi-point, Spot, Center-weighted
- Battery
- 1 rechargeable D-60 battery or 2 AAA batteries
- Dimensions
- 107 ×
- Lens
- 28 mm (in 35 mm full frame equivalent) 2.4
Specifications merged from Wikipedia, Wikidata, Lensfun and openMVG. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 4.80 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 | 19 mm | 83.3° | 69.4° | 96.8° |
| 4.5 mm | 22 mm | 76.6° | 63.2° | 90.1° |
| 5 mm | 24 mm | 70.8° | 58.0° | 84.1° |
| 6 mm | 29 mm | 61.3° | 49.6° | 73.8° |
| 8 mm | 38 mm | 47.9° | 38.2° | 58.8° |
| 10 mm | 48 mm | 39.1° | 31.0° | 48.5° |
| 12 mm | 58 mm | 33.0° | 26.0° | 41.2° |
| 15 mm | 72 mm | 26.7° | 20.9° | 33.4° |
| 20 mm | 96 mm | 20.2° | 15.8° | 25.4° |
| 25 mm | 120 mm | 16.2° | 12.6° | 20.4° |
| 30 mm | 144 mm | 13.5° | 10.6° | 17.1° |
| 40 mm | 192 mm | 10.2° | 7.9° | 12.9° |
| 50 mm | 240 mm | 8.1° | 6.3° | 10.3° |
| 70 mm | 336 mm | 5.8° | 4.5° | 7.4° |
| 100 mm | 480 mm | 4.1° | 3.2° | 5.2° |
| 150 mm | 720 mm | 2.7° | 2.1° | 3.4° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 6.2 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 | 45.6 cm | 3.94 m | ∞ | ∞ | ∞ | ∞ | 1.28 m |
| 4 mm | f/2.8 | 76.9 cm | ∞ | ∞ | ∞ | ∞ | ∞ | 91.8 cm |
| 4 mm | f/4 | 1.94 m | ∞ | ∞ | ∞ | ∞ | ∞ | 64.4 cm |
| 4 mm | f/8 | ∞ | ∞ | ∞ | ∞ | ∞ | ∞ | 32.4 cm |
| 9 mm | f/2 | 7.6 cm | 31.3 cm | 1.36 m | 3.52 m | 18.9 m | ∞ | 6.49 m |
| 9 mm | f/2.8 | 10.7 cm | 44.9 cm | 2.11 m | 6.66 m | ∞ | ∞ | 4.64 m |
| 9 mm | f/4 | 15.5 cm | 67.5 cm | 3.95 m | 37.5 m | ∞ | ∞ | 3.25 m |
| 9 mm | f/8 | 33.4 cm | 1.95 m | ∞ | ∞ | ∞ | ∞ | 1.63 m |
| 15 mm | f/2 | 2.7 cm | 11.0 cm | 44.7 cm | 1.02 m | 3.00 m | 16.0 m | 18.0 m |
| 15 mm | f/2.8 | 3.8 cm | 15.4 cm | 63.3 cm | 1.47 m | 4.56 m | 39.1 m | 12.9 m |
| 15 mm | f/4 | 5.4 cm | 22.2 cm | 92.7 cm | 2.24 m | 7.99 m | ∞ | 9.02 m |
| 15 mm | f/8 | 10.9 cm | 46.0 cm | 2.19 m | 7.11 m | ∞ | ∞ | 4.52 m |
| 25 mm | f/2 | 1.0 cm | 3.9 cm | 15.8 cm | 35.8 cm | 1.00 m | 4.16 m | 50.0 m |
| 25 mm | f/2.8 | 1.3 cm | 5.5 cm | 22.2 cm | 50.3 cm | 1.42 m | 6.06 m | 35.7 m |
| 25 mm | f/4 | 1.9 cm | 7.8 cm | 31.8 cm | 72.4 cm | 2.07 m | 9.49 m | 25.0 m |
| 25 mm | f/8 | 3.8 cm | 15.7 cm | 64.8 cm | 1.51 m | 4.73 m | 43.9 m | 12.5 m |
Equivalent aperture#
Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.
Diffraction & pixel pitch#
With 2.18 µm pixels, diffraction starts to soften pixel-level detail around f/3.2. For maximum sharpness keep landscapes between f/2.8 and f/3; stopping down further trades detail for depth of field.
| Aperture | Airy disk diameter | Spread over | At 100% view |
|---|---|---|---|
| f/2.8 | 3.8 µm | 1.7 px | sharp |
| f/4 | 5.4 µm | 2.5 px | slight softening |
| f/5.6 | 7.5 µm | 3.5 px | visibly soft |
| f/8 | 10.7 µm | 4.9 px | visibly soft |
| f/11 | 14.8 µm | 6.8 px | visibly soft |
| f/16 | 21.5 µm | 9.9 px | visibly soft |
| f/22 | 29.5 µm | 13.6 px | visibly soft |
Maximum print sizes#
At 8.1 MP the Ricoh GR Digital produces 3,264 × 2,448 pixel images. See the 8 megapixel guide or the print size calculator.
| Resolution | Typical use | Inches | Centimetres |
|---|---|---|---|
| 300 DPI | Photo-lab quality | 10.9 × 8.2 in | 28 × 21 cm |
| 240 DPI | Fine-art inkjet | 13.6 × 10.2 in | 35 × 26 cm |
| 200 DPI | Wall print | 16.3 × 12.2 in | 41 × 31 cm |
| 150 DPI | Poster, viewed from 1 m+ | 21.8 × 16.3 in | 55 × 41 cm |
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.
| Focal length | 500 rule | NPF f/1.8 | NPF f/2.8 | NPF f/4 |
|---|---|---|---|---|
| 4 mm (19 mm eq.) | 26.0 s | 32.1 s | 40.8 s | 51.3 s |
| 5 mm (24 mm eq.) | 20.8 s | 25.7 s | 32.7 s | 41.1 s |
| 6 mm (29 mm eq.) | 17.4 s | 21.4 s | 27.2 s | 34.2 s |
| 7 mm (34 mm eq.) | 14.9 s | 18.3 s | 23.3 s | 29.3 s |
| 10 mm (48 mm eq.) | 10.4 s | 12.8 s | 16.3 s | 20.5 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 |
| 10 mm | 1/50 s | 1/6 s | 0.6 s |
| 21 mm | 1/100 s | 1/13 s | 0.3 s |
| 42 mm | 1/200 s | 1/25 s | 1/6 s |
Lens#
The Ricoh GR Digital 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 × 4.80.
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?
The Ricoh GR Digital has a crop factor of 4.80× relative to 35 mm full frame (diagonal 9.0 mm vs 43.3 mm).
What size is the Ricoh GR Digital sensor?
7.1 × 5.5 mm (1/1.7"), an area of 39 mm² — 5% of full frame.
Is the Ricoh GR Digital full frame?
No — its sensor is 1/1.7", which is 21.9× smaller in area than full frame.
How many megapixels does the Ricoh GR Digital have?
8.1 megapixels (3,264 × 2,448 pixels), enough for a 11 × 8 inch print at 300 DPI.
How long can I expose the night sky with the Ricoh GR Digital?
With a 5 mm lens (24 mm equivalent) the 500 rule gives 21 s and the stricter NPF rule at f/2.8 gives 33 s.
Sources & licences#
- Wikipedia: Ricoh GR Digital — CC BY-SA 4.0
- Wikidata Q7332326 — 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