Sony α7R III Specs, Sensor Size & Crop Factor

Q: What is the crop factor of the Sony α7R III?

The Sony α7R III has a crop factor of 1.00× relative to 35 mm full frame (diagonal 43.2 mm vs 43.3 mm).

1.00×

Crop factor

35.9×24.0 mm

Sensor size

862 mm²

Area · 100% of full frame

42 MP

Resolution

4.51 µm

Pixel pitch

f/6.7

Diffraction-limited aperture

Specifications#

Brand: Sony
Model: α7R III
Also known as: ILCE-7RM3, Sony ILCE-7RM3
Camera type: Mirrorless
Lens mount: Sony E-mount
Sensor size: 35.9 × 24.0 mm (Full frame (35 mm))
Crop factor: 1.00×
Resolution: 42 MP (7,952 × 5,304 px)
ISO range: 100 – 32,000
Fastest shutter: 1/8,000 s
Continuous shooting: 10 fps
Max video resolution: 4K
Weight: 657 g (23.2 oz)
Sensor type: BSI-CMOS
Viewfinder: EVF(Electronic View Finder)
AF points / area: 425 focus points
Flash: no
Dimensions: 127 by
Successor: Sony α7R IV
Predecessor: Sony α7R II
Made in: China
Drive: 10 frames per second
Video: 4K video up to 30 fps

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

Sensor size compared#

The Sony α7R III sensor (highlighted) drawn to scale against common formats. Its area is 100% of a full-frame sensor.

Focal length equivalents & field of view#

Multiply any focal length by 1.00 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
10 mm	10 mm	121.8°	100.4°	130.3°
12 mm	12 mm	112.5°	90.0°	121.9°
14 mm	14 mm	104.1°	81.2°	114.1°
16 mm	16 mm	96.6°	73.7°	106.9°
18 mm	18 mm	89.8°	67.4°	100.4°
20 mm	20 mm	83.8°	61.9°	94.4°
24 mm	24 mm	73.6°	53.1°	84.0°
28 mm	28 mm	65.3°	46.4°	75.3°
35 mm	35 mm	54.3°	37.8°	63.3°
40 mm	40 mm	48.3°	33.4°	56.7°
50 mm	50 mm	39.5°	27.0°	46.7°
56 mm	56 mm	35.5°	24.2°	42.2°
70 mm	70 mm	28.8°	19.5°	34.3°
85 mm	85 mm	23.8°	16.1°	28.5°
100 mm	100 mm	20.4°	13.7°	24.4°
135 mm	135 mm	15.1°	10.2°	18.2°
200 mm	200 mm	10.3°	6.9°	12.3°
300 mm	301 mm	6.8°	4.6°	8.2°
400 mm	401 mm	5.1°	3.4°	6.2°
600 mm	601 mm	3.4°	2.3°	4.1°
800 mm	802 mm	2.6°	1.7°	3.1°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 29.9 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
22 mm	f/1.8	5.3 cm	22.0 cm	92.6 cm	2.24 m	8.00 m	∞	9.00 m
22 mm	f/2.8	8.3 cm	34.9 cm	1.55 m	4.22 m	33.6 m	∞	5.80 m
22 mm	f/4	12.0 cm	51.4 cm	2.57 m	9.68 m	∞	∞	4.06 m
22 mm	f/8	25.1 cm	1.26 m	94.0 m	∞	∞	∞	2.04 m
43 mm	f/1.8	1.3 cm	5.6 cm	22.9 cm	52.1 cm	1.48 m	6.34 m	34.3 m
43 mm	f/2.8	2.1 cm	8.7 cm	35.8 cm	81.9 cm	2.37 m	11.3 m	22.1 m
43 mm	f/4	3.0 cm	12.4 cm	51.5 cm	1.19 m	3.58 m	22.1 m	15.5 m
43 mm	f/8	5.9 cm	25.2 cm	1.08 m	2.69 m	10.9 m	∞	7.76 m
73 mm	f/1.8	0.4 cm	1.9 cm	7.8 cm	17.8 cm	50.0 cm	2.03 m	98.9 m
73 mm	f/2.8	0.7 cm	2.9 cm	12.1 cm	27.7 cm	78.0 cm	3.20 m	63.6 m
73 mm	f/4	1.0 cm	4.2 cm	17.4 cm	39.6 cm	1.12 m	4.70 m	44.6 m
73 mm	f/8	1.9 cm	8.3 cm	34.9 cm	80.3 cm	2.33 m	11.1 m	22.3 m
120 mm	f/1.8	0.1 cm	0.7 cm	2.8 cm	6.5 cm	18.3 cm	74.1 cm	267 m
120 mm	f/2.8	0.2 cm	1.0 cm	4.4 cm	10.1 cm	28.4 cm	1.15 m	172 m
120 mm	f/4	0.3 cm	1.5 cm	6.3 cm	14.4 cm	40.7 cm	1.65 m	120 m
120 mm	f/8	0.6 cm	2.9 cm	12.5 cm	28.8 cm	81.7 cm	3.38 m	60.2 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 43 mm
f/1.2	f/1.2	51.5 m
f/1.4	f/1.4	44.2 m
f/1.8	f/1.8	34.3 m
f/2	f/2.0	30.9 m
f/2.8	f/2.8	22.1 m
f/4	f/4.0	15.5 m
f/5.6	f/5.6	11.1 m
f/8	f/8.0	7.76 m

Diffraction & pixel pitch#

With 4.51 µm pixels, diffraction starts to soften pixel-level detail around f/6.7. For maximum sharpness keep landscapes between f/3.7 and f/7; stopping down further trades detail for depth of field.

Aperture	Airy disk diameter	Spread over	At 100% view
f/2.8	3.8 µm	0.8 px	sharp
f/4	5.4 µm	1.2 px	sharp
f/5.6	7.5 µm	1.7 px	sharp
f/8	10.7 µm	2.4 px	slight softening
f/11	14.8 µm	3.3 px	visibly soft
f/16	21.5 µm	4.8 px	visibly soft
f/22	29.5 µm	6.5 px	visibly soft

Maximum print sizes#

At 42 MP the Sony α7R III produces 7,952 × 5,304 pixel images. See the 42 megapixel guide or the print size calculator.

Resolution	Typical use	Inches	Centimetres
300 DPI	Photo-lab quality	26.5 × 17.7 in	67 × 45 cm
240 DPI	Fine-art inkjet	33.1 × 22.1 in	84 × 56 cm
200 DPI	Wall print	39.8 × 26.5 in	101 × 67 cm
150 DPI	Poster, viewed from 1 m+	53.0 × 35.4 in	135 × 90 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
14 mm (14 mm eq.)	35.6 s	14.2 s	16.7 s	19.7 s
20 mm (20 mm eq.)	25.0 s	9.9 s	11.7 s	13.8 s
24 mm (24 mm eq.)	20.8 s	8.3 s	9.7 s	11.5 s
35 mm (35 mm eq.)	14.3 s	5.7 s	6.7 s	7.9 s
50 mm (50 mm eq.)	10.0 s	4.0 s	4.7 s	5.5 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
24 mm	1/25 s	0.3 s	1.3 s
50 mm	1/50 s	1/6 s	0.6 s
100 mm	1/100 s	1/13 s	0.3 s
200 mm	1/200 s	1/25 s	1/6 s

Lenses for the Sony α7R III#

Native Sony E-mount lenses in our database (174 total). Also adaptable: T-mount (T2), M39 / LTM (Leica thread), M42 screw mount, Deckel (DKL).

Sony FE 12-24mm f/4 G 12–24 mm
Sony FE 20-70mm f/4 G 20–70 mm
Sony FE 20mm f/1.8 G 20 mm
Sony FE 24-105mm f/4 G OSS 24–105 mm
Sony FE 28-60mm f/4-5.6 28–60 mm
Sony FE 28-70mm f/3.5-5.6 OSS 28–70 mm
Sony FE 50mm f/1.2 GM 50 mm
Sony FE 70-200mm f/2.8 GM OSS 70–200 mm
Sony FE 70-200mm f/4 G OSS 70–200 mm
Sony FE 70-300mm f/4.5-5.6 G OSS 70–300 mm
Sony FE 85mm f/1.4 GM 85 mm
Sony FE 85mm f/1.8 85 mm
Sony FE 90mm f/2.8 Macro G OSS 90 mm
Sony FE 200-600mm f/5.6-6.3 G OSS 200–600 mm
Samyang 8mm f/2.8 UMC Fish-eye 8 mm
Samyang 8mm f/3.5 Fish-Eye CS 8 mm
Laowa 9mm f/2.8 Zero-D 9 mm
Laowa 9mm f/5.6 FF RL 9 mm
Viltrox AF 9mm f/2.8 Z/E/XF 9 mm
Laowa 10mm f/2.8 Zero-D FF 10 mm
Samyang 10mm f/2.8 ED AS NCS CS 10 mm
Sigma 10-18mm F2.8 DC DN | Contemporary 023 10–18 mm
Sony E 10-18mm f/4 OSS 10–18 mm
Voigtländer Heliar-Hyper Wide 10mm F5.6 10 mm
Sony E 11mm f/1.8 11 mm
Tamron 11-20mm f/2.8 Di III-A RXD (B060) 11–20 mm
Laowa 12mm f/2.8 Zero-D 12 mm
Samyang 12mm f/2.0 NCS CS 12 mm
Samyang 12mm f/2.8 Fish-Eye ED AS NCS 12 mm
Samyang AF 12mm f/2.0 12 mm
Zeiss Touit 2.8/12 12 mm
Viltrox AF 13mm F1.4 13 mm
Samyang 14mm f/2.8 AE ED AS IF UMC 14 mm
Samyang AF 14mm f/2.8 14 mm
Sigma 14-24mm F2.8 DG DN | Art 019 14–24 mm
Sigma 14mm f/1.8 DG HSM | A 14 mm

Similar cameras#

Other Full frame (35 mm) cameras from around the same time.

Frequently asked questions#

What is the crop factor of the Sony α7R III?

The Sony α7R III has a crop factor of 1.00× relative to 35 mm full frame (diagonal 43.2 mm vs 43.3 mm).

What size is the Sony α7R III sensor?

35.9 × 24.0 mm (Full frame (35 mm)), an area of 862 mm² — 100% of full frame.

Is the Sony α7R III full frame?

Yes — its sensor is the same 36 × 24 mm size as 35 mm film.

How many megapixels does the Sony α7R III have?

42 megapixels (7,952 × 5,304 pixels), enough for a 27 × 18 inch print at 300 DPI.

What lens mount does the Sony α7R III use?

The Sony α7R III uses the Sony E-mount (flange distance 18.00 mm).

How long can I expose the night sky with the Sony α7R III?

With a 20 mm lens (20 mm equivalent) the 500 rule gives 25 s and the stricter NPF rule at f/2.8 gives 12 s.

Sources & licences#

Wikipedia: Sony %CE%B17R III — CC BY-SA 4.0
Wikidata Q42421205 — 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