Ricoh WG-20 Specs, Sensor Size & Crop Factor

Q: What is the crop factor of the Ricoh WG-20?

The Ricoh WG-20 has a crop factor of 5.64× relative to 35 mm full frame (diagonal 7.7 mm vs 43.3 mm).

5.64×

Crop factor

6.2×4.5 mm

Sensor size

28 mm²

Area · 3% of full frame

14 MP

Resolution

1.44 µm

Pixel pitch

f/2.1

Diffraction-limited aperture

Specifications#

Brand: Ricoh
Model: WG-20
Camera type: Compact
Sensor size: 6.2 × 4.5 mm (1/2.3" sensor)
Crop factor: 5.64×
Resolution: 14 MP (4,288 × 3,216 px)
Fastest shutter: 1/1,500 s
Continuous shooting: 1 fps
Weight: 164 g (5.8 oz)
Sensor type: CCD
AF points / area: 9 focus points
Dimensions: 114 x 58 x 28 mm (4.49 x 2.28 x 1.1 inches)
Lens: 28-140mm equivalent
Launch price: US $199.95
Drive: 1 frame per second

Specifications merged from Wikipedia, Wikidata and openMVG. Spot an error? Tell us.

Sensor size compared#

The Ricoh WG-20 sensor (highlighted) drawn to scale against common formats. Its area is 3% of a full-frame sensor, which collects about 4.9 stops less total light at the same exposure.

Focal length equivalents & field of view#

Multiply any focal length by 5.64 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	23 mm	75.3°	59.3°	87.6°
4.5 mm	25 mm	68.9°	53.6°	80.8°
5 mm	28 mm	63.3°	48.9°	74.9°
6 mm	34 mm	54.4°	41.5°	65.1°
8 mm	45 mm	42.2°	31.7°	51.2°
10 mm	56 mm	34.3°	25.6°	41.9°
12 mm	68 mm	28.8°	21.5°	35.4°
15 mm	85 mm	23.2°	17.2°	28.7°
20 mm	113 mm	17.5°	13.0°	21.7°
25 mm	141 mm	14.1°	10.4°	17.4°
30 mm	169 mm	11.7°	8.7°	14.6°
40 mm	226 mm	8.8°	6.5°	10.9°
50 mm	282 mm	7.1°	5.2°	8.8°
70 mm	395 mm	5.0°	3.7°	6.3°
100 mm	564 mm	3.5°	2.6°	4.4°
150 mm	847 mm	2.4°	1.7°	2.9°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 5.3 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	37.0 cm	2.35 m	∞	∞	∞	∞	1.51 m
4 mm	f/2.8	58.6 cm	13.1 m	∞	∞	∞	∞	1.08 m
4 mm	f/4	1.17 m	∞	∞	∞	∞	∞	75.7 cm
4 mm	f/8	∞	∞	∞	∞	∞	∞	38.0 cm
8 mm	f/2	8.2 cm	33.9 cm	1.49 m	3.96 m	26.5 m	∞	6.03 m
8 mm	f/2.8	11.6 cm	48.7 cm	2.36 m	8.09 m	∞	∞	4.31 m
8 mm	f/4	16.8 cm	73.9 cm	4.71 m	500 m	∞	∞	3.02 m
8 mm	f/8	36.6 cm	2.33 m	∞	∞	∞	∞	1.51 m
14 mm	f/2	2.6 cm	10.7 cm	43.6 cm	99.8 cm	2.92 m	15.3 m	18.5 m
14 mm	f/2.8	3.7 cm	15.1 cm	61.7 cm	1.43 m	4.42 m	35.7 m	13.2 m
14 mm	f/4	5.3 cm	21.6 cm	90.4 cm	2.17 m	7.65 m	∞	9.23 m
14 mm	f/8	10.7 cm	44.8 cm	2.12 m	6.70 m	∞	∞	4.62 m
22 mm	f/2	1.1 cm	4.3 cm	17.4 cm	39.4 cm	1.11 m	4.60 m	45.5 m
22 mm	f/2.8	1.5 cm	6.0 cm	24.4 cm	55.4 cm	1.57 m	6.77 m	32.5 m
22 mm	f/4	2.1 cm	8.6 cm	35.0 cm	79.9 cm	2.30 m	10.9 m	22.8 m
22 mm	f/8	4.2 cm	17.3 cm	71.7 cm	1.69 m	5.41 m	75.8 m	11.4 m

Equivalent aperture#

Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.

Aperture on this camera	Full-frame equivalent (depth of field)	Hyperfocal at 8 mm
f/1.2	f/6.8	10.0 m
f/1.4	f/7.9	8.61 m
f/1.8	f/10.2	6.70 m
f/2	f/11.3	6.03 m
f/2.8	f/15.8	4.31 m
f/4	f/22.6	3.02 m
f/5.6	f/31.6	2.16 m
f/8	f/45.2	1.51 m

Diffraction & pixel pitch#

With 1.44 µm pixels, diffraction starts to soften pixel-level detail around f/2.1. For maximum sharpness keep landscapes between f/2.8 and f/2; stopping down further trades detail for depth of field.

Aperture	Airy disk diameter	Spread over	At 100% view
f/2.8	3.8 µm	2.6 px	slight softening
f/4	5.4 µm	3.7 px	visibly soft
f/5.6	7.5 µm	5.2 px	visibly soft
f/8	10.7 µm	7.5 px	visibly soft
f/11	14.8 µm	10.3 px	visibly soft
f/16	21.5 µm	14.9 px	visibly soft
f/22	29.5 µm	20.5 px	visibly soft

Maximum print sizes#

At 14 MP the Ricoh WG-20 produces 4,288 × 3,216 pixel images. See the 14 megapixel guide or the print size calculator.

Resolution	Typical use	Inches	Centimetres
300 DPI	Photo-lab quality	14.3 × 10.7 in	36 × 27 cm
240 DPI	Fine-art inkjet	17.9 × 13.4 in	45 × 34 cm
200 DPI	Wall print	21.4 × 16.1 in	54 × 41 cm
150 DPI	Poster, viewed from 1 m+	28.6 × 21.4 in	73 × 54 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 (23 mm eq.)	22.1 s	26.5 s	35.3 s	45.8 s
5 mm (28 mm eq.)	17.7 s	21.2 s	28.2 s	36.6 s
6 mm (34 mm eq.)	14.8 s	17.7 s	23.5 s	30.5 s
7 mm (40 mm eq.)	12.7 s	15.2 s	20.2 s	26.2 s
9 mm (51 mm eq.)	9.8 s	11.8 s	15.7 s	20.4 s

Open the NPF / 500 rule calculator →

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
9 mm	1/50 s	1/6 s	0.6 s
18 mm	1/100 s	1/13 s	0.3 s
35 mm	1/200 s	1/25 s	1/6 s

Lens#

The Ricoh WG-20 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 × 5.64.

Similar cameras#

Other 1/2.3" cameras from around the same time.

Frequently asked questions#

What is the crop factor of the Ricoh WG-20?

The Ricoh WG-20 has a crop factor of 5.64× relative to 35 mm full frame (diagonal 7.7 mm vs 43.3 mm).

What size is the Ricoh WG-20 sensor?

6.2 × 4.5 mm (1/2.3"), an area of 28 mm² — 3% of full frame.

Is the Ricoh WG-20 full frame?

No — its sensor is 1/2.3", which is 30.8× smaller in area than full frame.

How many megapixels does the Ricoh WG-20 have?

14 megapixels (4,288 × 3,216 pixels), enough for a 14 × 11 inch print at 300 DPI.

How long can I expose the night sky with the Ricoh WG-20?

With a 5 mm lens (28 mm equivalent) the 500 rule gives 18 s and the stricter NPF rule at f/2.8 gives 28 s.

Sources & licences#

Last updated October 03, 2026 · How we calculate · Sources