Epson R-D1 Specs, Sensor Size & Crop Factor

Q: What is the crop factor of the Epson R-D1?

The Epson R-D1 has a crop factor of 1.52× relative to 35 mm full frame (diagonal 28.4 mm vs 43.3 mm).

1.52×

Crop factor

23.7×15.6 mm

Sensor size

370 mm²

Area · 43% of full frame

6.1 MP

Resolution

7.79 µm

Pixel pitch

f/11.6

Diffraction-limited aperture

Specifications#

Brand: Epson
Model: R-D1
Camera type: Mirrorless
Lens mount: Leica M
Sensor size: 23.7 × 15.6 mm (APS-C)
Crop factor: 1.52×
Resolution: 6.1 MP (3,044 × 2,004 px)
ISO range: 200 – 1,600
Weight: 560 g (19.8 oz)
Sensor: 23.7 x 15.6 mm, 1.53 × CCD APS-C
Storage: SD
Viewfinder: Optical rangefinder (1:1)
Metering: Center-weighted
Exposure modes: Manual, Aperture priority
Shutter: Electronically controlled vertical-run focal plane shutter
Flash: External via hot shoe with full size X-sync port
Battery: Li-Ion EPALB1 Rechargeable
Dimensions: 142 x 89 x 40 mm
Lens: Leica M-mount

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

Sensor size compared#

The Epson R-D1 sensor (highlighted) drawn to scale against common formats. Its area is 43% of a full-frame sensor, which collects about 1.2 stops less total light at the same exposure.

Focal length equivalents & field of view#

Multiply any focal length by 1.52 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
8 mm	12 mm	112.0°	88.5°	121.2°
10 mm	15 mm	99.7°	75.9°	109.6°
12 mm	18 mm	89.3°	66.0°	99.5°
14 mm	21 mm	80.5°	58.2°	90.8°
16 mm	24 mm	73.0°	52.0°	83.1°
18 mm	27 mm	66.7°	46.9°	76.5°
20 mm	30 mm	61.3°	42.6°	70.7°
24 mm	37 mm	52.6°	36.0°	61.2°
28 mm	43 mm	45.9°	31.1°	53.7°
35 mm	53 mm	37.4°	25.1°	44.1°
40 mm	61 mm	33.0°	22.1°	39.1°
50 mm	76 mm	26.7°	17.7°	31.7°
56 mm	85 mm	23.9°	15.9°	28.4°
70 mm	107 mm	19.2°	12.7°	22.9°
85 mm	130 mm	15.9°	10.5°	19.0°
100 mm	152 mm	13.5°	8.9°	16.1°
135 mm	206 mm	10.0°	6.6°	12.0°
200 mm	305 mm	6.8°	4.5°	8.1°
300 mm	457 mm	4.5°	3.0°	5.4°
400 mm	610 mm	3.4°	2.2°	4.1°
600 mm	915 mm	2.3°	1.5°	2.7°
800 mm	1220 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 19.7 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	36.8 cm	1.65 m	4.57 m	47.8 m	∞	5.55 m
14 mm	f/2.8	13.9 cm	60.0 cm	3.24 m	17.0 m	∞	∞	3.57 m
14 mm	f/4	20.3 cm	93.9 cm	8.76 m	∞	∞	∞	2.50 m
14 mm	f/8	46.0 cm	4.24 m	∞	∞	∞	∞	1.26 m
28 mm	f/1.8	2.1 cm	8.8 cm	35.9 cm	82.0 cm	2.37 m	11.3 m	22.2 m
28 mm	f/2.8	3.3 cm	13.7 cm	56.5 cm	1.31 m	3.98 m	27.5 m	14.3 m
28 mm	f/4	4.7 cm	19.7 cm	82.4 cm	1.96 m	6.65 m	∞	9.99 m
28 mm	f/8	9.6 cm	40.6 cm	1.88 m	5.56 m	2.7 km	∞	5.01 m
48 mm	f/1.8	0.7 cm	2.9 cm	12.0 cm	27.3 cm	76.6 cm	3.13 m	65.1 m
48 mm	f/2.8	1.1 cm	4.6 cm	18.7 cm	42.6 cm	1.20 m	5.04 m	41.9 m
48 mm	f/4	1.5 cm	6.5 cm	26.8 cm	61.1 cm	1.74 m	7.69 m	29.3 m
48 mm	f/8	3.1 cm	13.1 cm	54.3 cm	1.26 m	3.82 m	25.3 m	14.7 m
78 mm	f/1.8	0.2 cm	1.1 cm	4.5 cm	10.2 cm	28.7 cm	1.16 m	172 m
78 mm	f/2.8	0.4 cm	1.7 cm	7.0 cm	15.9 cm	44.7 cm	1.81 m	111 m
78 mm	f/4	0.5 cm	2.4 cm	10.0 cm	22.7 cm	63.9 cm	2.61 m	77.4 m
78 mm	f/8	1.1 cm	4.8 cm	19.9 cm	45.6 cm	1.29 m	5.50 m	38.7 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 28 mm
f/1.2	f/1.8	33.2 m
f/1.4	f/2.1	28.5 m
f/1.8	f/2.7	22.2 m
f/2	f/3.0	20.0 m
f/2.8	f/4.3	14.3 m
f/4	f/6.1	9.99 m
f/5.6	f/8.5	7.14 m
f/8	f/12.2	5.01 m

Diffraction & pixel pitch#

With 7.79 µm pixels, diffraction starts to soften pixel-level detail around f/11.6. For maximum sharpness keep landscapes between f/6.4 and f/12; stopping down further trades detail for depth of field.

Aperture	Airy disk diameter	Spread over	At 100% view
f/2.8	3.8 µm	0.5 px	sharp
f/4	5.4 µm	0.7 px	sharp
f/5.6	7.5 µm	1.0 px	sharp
f/8	10.7 µm	1.4 px	sharp
f/11	14.8 µm	1.9 px	sharp
f/16	21.5 µm	2.8 px	slight softening
f/22	29.5 µm	3.8 px	visibly soft

Maximum print sizes#

At 6.1 MP the Epson R-D1 produces 3,044 × 2,004 pixel images. See the 6 megapixel guide or the print size calculator.

Resolution	Typical use	Inches	Centimetres
300 DPI	Photo-lab quality	10.1 × 6.7 in	26 × 17 cm
240 DPI	Fine-art inkjet	12.7 × 8.3 in	32 × 21 cm
200 DPI	Wall print	15.2 × 10.0 in	39 × 25 cm
150 DPI	Poster, viewed from 1 m+	20.3 × 13.4 in	52 × 34 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
9 mm (14 mm eq.)	36.4 s	33.0 s	36.8 s	41.5 s
13 mm (20 mm eq.)	25.2 s	22.8 s	25.5 s	28.7 s
16 mm (24 mm eq.)	20.5 s	18.5 s	20.7 s	23.3 s
23 mm (35 mm eq.)	14.3 s	12.9 s	14.4 s	16.2 s
33 mm (50 mm eq.)	9.9 s	9.0 s	10.0 s	11.3 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
16 mm	1/25 s	0.3 s	1.3 s
33 mm	1/50 s	1/6 s	0.6 s
66 mm	1/100 s	1/13 s	0.3 s
131 mm	1/200 s	1/25 s	1/6 s

Lenses for the Epson R-D1#

Native Leica M lenses in our database (8 total). Also adaptable: T-mount (T2), M39 / LTM (Leica thread), M42 screw mount, Deckel (DKL).

Voigtländer Nokton 28mm F1.5 Aspherical 28 mm
Laowa 85mm f/5.6 2X Ultra Macro APO 85 mm
Leica Elmarit-M 1:2.8/28 Asph. 28 mm
Leica Summicron-M 1:2/28 Asph. 28 mm
Leica Summicron-M 1:2/35 Asph. (11879/11882) 35 mm
Leica Summicron-M 1:2/50 50 mm
Leica APO-Summicron-M 1:2/75 Asph. (11673/11701) 75 mm
Leica Elmarit-M 1:2.8/90 90 mm

Similar cameras#

Other APS-C cameras from around the same time.

Frequently asked questions#

What is the crop factor of the Epson R-D1?

The Epson R-D1 has a crop factor of 1.52× relative to 35 mm full frame (diagonal 28.4 mm vs 43.3 mm).

What size is the Epson R-D1 sensor?

23.7 × 15.6 mm (APS-C), an area of 370 mm² — 43% of full frame.

Is the Epson R-D1 full frame?

No — its sensor is APS-C, which is 2.3× smaller in area than full frame.

How many megapixels does the Epson R-D1 have?

6.1 megapixels (3,044 × 2,004 pixels), enough for a 10 × 7 inch print at 300 DPI.

What lens mount does the Epson R-D1 use?

The Epson R-D1 uses the Leica M (flange distance 27.80 mm).

How long can I expose the night sky with the Epson R-D1?

With a 13 mm lens (20 mm equivalent) the 500 rule gives 25 s and the stricter NPF rule at f/2.8 gives 26 s.

Sources & licences#

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