Specifications#
- Brand
- Ricoh
- Model
- GR IIIx
- Camera type
- Compact
- Released
- 2021-10-01
- Sensor size
- 23.5 × 15.7 mm (APS-C)
- Crop factor
- 1.53×
- Weight
- 257 g (9.1 oz)
Specifications merged from Wikidata and Lensfun. Spot an error? Tell us.
Sensor size compared#
Focal length equivalents & field of view#
Multiply any focal length by 1.53 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 |
|---|---|---|---|---|
| 8 mm | 12 mm | 111.6° | 88.9° | 121.0° |
| 10 mm | 15 mm | 99.3° | 76.2° | 109.5° |
| 12 mm | 18 mm | 88.9° | 66.3° | 99.4° |
| 14 mm | 21 mm | 80.1° | 58.5° | 90.6° |
| 16 mm | 24 mm | 72.7° | 52.2° | 82.9° |
| 18 mm | 28 mm | 66.3° | 47.1° | 76.3° |
| 20 mm | 31 mm | 60.9° | 42.8° | 70.5° |
| 24 mm | 37 mm | 52.2° | 36.2° | 61.0° |
| 28 mm | 43 mm | 45.6° | 31.3° | 53.6° |
| 35 mm | 54 mm | 37.2° | 25.3° | 44.0° |
| 40 mm | 61 mm | 32.8° | 22.2° | 38.9° |
| 50 mm | 76 mm | 26.5° | 17.8° | 31.6° |
| 56 mm | 86 mm | 23.7° | 15.9° | 28.3° |
| 70 mm | 107 mm | 19.1° | 12.8° | 22.8° |
| 85 mm | 130 mm | 15.8° | 10.5° | 18.9° |
| 100 mm | 153 mm | 13.4° | 9.0° | 16.1° |
| 135 mm | 207 mm | 10.0° | 6.7° | 12.0° |
| 200 mm | 306 mm | 6.7° | 4.5° | 8.1° |
| 300 mm | 459 mm | 4.5° | 3.0° | 5.4° |
| 400 mm | 612 mm | 3.4° | 2.2° | 4.0° |
| 600 mm | 918 mm | 2.2° | 1.5° | 2.7° |
| 800 mm | 1224 mm | 1.7° | 1.1° | 2.0° |
Depth of field table#
Total depth of field at each subject distance, using a circle of confusion of 19.6 µm (the 0.030 mm full-frame standard scaled by the crop factor). Detailed tables: 24 mm f/1.8, 24 mm f/2.8, 35 mm f/1.8, 35 mm f/2.8, 50 mm f/1.8, 50 mm f/2.8.
| Focal | Aperture | 50.0 cm | 1.00 m | 2.00 m | 3.00 m | 5.00 m | 10.0 m | Hyperfocal |
|---|---|---|---|---|---|---|---|---|
| 14 mm | f/1.8 | 8.8 cm | 36.7 cm | 1.64 m | 4.54 m | 46.3 m | ∞ | 5.57 m |
| 14 mm | f/2.8 | 13.9 cm | 59.8 cm | 3.22 m | 16.7 m | ∞ | ∞ | 3.58 m |
| 14 mm | f/4 | 20.2 cm | 93.5 cm | 8.63 m | ∞ | ∞ | ∞ | 2.51 m |
| 14 mm | f/8 | 45.8 cm | 4.18 m | ∞ | ∞ | ∞ | ∞ | 1.26 m |
| 28 mm | f/1.8 | 2.1 cm | 8.8 cm | 35.8 cm | 81.7 cm | 2.36 m | 11.2 m | 22.2 m |
| 28 mm | f/2.8 | 3.3 cm | 13.7 cm | 56.3 cm | 1.31 m | 3.96 m | 27.3 m | 14.3 m |
| 28 mm | f/4 | 4.7 cm | 19.6 cm | 82.1 cm | 1.96 m | 6.61 m | 4.3 km | 10.0 m |
| 28 mm | f/8 | 9.5 cm | 40.4 cm | 1.87 m | 5.52 m | 976 m | ∞ | 5.03 m |
| 48 mm | f/1.8 | 0.7 cm | 2.9 cm | 12.0 cm | 27.2 cm | 76.3 cm | 3.12 m | 65.3 m |
| 48 mm | f/2.8 | 1.1 cm | 4.5 cm | 18.6 cm | 42.4 cm | 1.20 m | 5.03 m | 42.0 m |
| 48 mm | f/4 | 1.5 cm | 6.5 cm | 26.7 cm | 60.9 cm | 1.74 m | 7.65 m | 29.4 m |
| 48 mm | f/8 | 3.1 cm | 13.0 cm | 54.1 cm | 1.26 m | 3.80 m | 25.1 m | 14.7 m |
| 78 mm | f/1.8 | 0.2 cm | 1.1 cm | 4.5 cm | 10.2 cm | 28.6 cm | 1.16 m | 172 m |
| 78 mm | f/2.8 | 0.4 cm | 1.7 cm | 6.9 cm | 15.8 cm | 44.5 cm | 1.81 m | 111 m |
| 78 mm | f/4 | 0.5 cm | 2.4 cm | 9.9 cm | 22.6 cm | 63.7 cm | 2.60 m | 77.6 m |
| 78 mm | f/8 | 1.1 cm | 4.8 cm | 19.9 cm | 45.5 cm | 1.29 m | 5.48 m | 38.9 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 |
|---|---|
| 9 mm (14 mm eq.) | 36.3 s |
| 13 mm (20 mm eq.) | 25.1 s |
| 16 mm (24 mm eq.) | 20.4 s |
| 23 mm (35 mm eq.) | 14.2 s |
| 33 mm (50 mm eq.) | 9.9 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 |
|---|---|---|---|
| 16 mm | 1/25 s | 0.3 s | 1.3 s |
| 33 mm | 1/50 s | 1/6 s | 0.6 s |
| 65 mm | 1/100 s | 1/13 s | 0.3 s |
| 131 mm | 1/200 s | 1/25 s | 1/6 s |
Lens#
The Ricoh GR IIIx 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 × 1.53.
Similar cameras#
Other APS-C cameras from around the same time.
- Nikon Zfc 2021
- Sony ZV-E10 2021
- Nikon Z30 2022
- Nikon Z50 2019
- Fujifilm X-E4 2021
- Fujifilm X-T30 II 2021
- Fujifilm X-H2S 2022
- Fujifilm X-T5 2022
- Sony FX30 2022
- Fujifilm X-S10 2020
- Fujifilm X-T200 2020
- Fujifilm X-T4 2020
Frequently asked questions#
What is the crop factor of the Ricoh GR IIIx?
The Ricoh GR IIIx has a crop factor of 1.53× relative to 35 mm full frame (diagonal 28.3 mm vs 43.3 mm).
What size is the Ricoh GR IIIx sensor?
23.5 × 15.7 mm (APS-C), an area of 369 mm² — 43% of full frame.
Is the Ricoh GR IIIx full frame?
No — its sensor is APS-C, which is 2.3× smaller in area than full frame.
How long can I expose the night sky with the Ricoh GR IIIx?
With a 13 mm lens (20 mm equivalent) the 500 rule gives 25 s.
Sources & licences#
- Wikidata Q136323648 — CC0
- Lensfun camera database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources