Sony Alpha a9 II vs Canon EOS RP Comparison

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Alpha a9 II image
vs
EOS RP image
Sony Alpha a9 II Canon EOS RP
Megapixels
24.20
26.20
Image resolution
6000 x 4000
6240 x 4160

Sensor

Sensor type
CMOS
CMOS
Sensor size
35.6 x 23.8 mm
35.9 x 24 mm
Sensor resolution
6026 x 4017
6269 x 4179
Diagonal
42.82 mm
43.18 mm
Compare sensor size:

Sensor Size

Actual size is set to screen
vs
1:1.02
(ratio)
Sony Alpha a9 II Canon EOS RP
Surface area:
847.28 mm² vs 861.60 mm²
Difference: 14.32 mm² (2%)
RP sensor is slightly bigger than Alpha a9 II sensor (only 2% difference).
Pixel pitch
5.91 µm
5.73 µm
Difference: 0.18 µm (3%)
Pixel pitch of Alpha a9 II is ~3% higher than RP's.
Pixel area
34.93 µm²
32.83 µm²
Relative pixel sizes:
vs
Pixel area difference: 2.1 µm² (6%)
Pixel on Sony Alpha a9 II sensor is ~6% bigger than Canon RP's.
Pixel density
2.87 MP/cm²
3.05 MP/cm²
Difference: 0.18 µm (6%)
Canon RP has ~6% higher pixel density than Sony Alpha a9 II's.

Specs

Sony Alpha a9 II
Canon RP
Crop factor
1.01
1
Megapixels
28.30
27.10
Optical zoom
 
Digital zoom
ISO range
Auto, 100-51200 (expands to 50-204800)
Auto, 100-40000 (extends to 50-102400)
RAW support
Manual focus
Focus range
n/a
Macro focus range
n/a
Focal length
n/a
Aperture priority
Max. aperture
n/a
Metering types
Multi, Center-weighted, Highlight-weighted, Average, Spot
Evaluative, Partial, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV steps)
±3 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Shutter speed (min)
30s
30s
Shutter speed (max)
1/32000s
1/4000s
Built-in flash
External flash
Viewfinder type
Electronic
Electronic
White balance
9
6
Screen size
3"
3"
Screen resolution
1,440,000 dots
1,040,000 dots
Video available
Max. video resolution
3840x2160 (30p/​25p/​24p)
3840x2160 (25p/24p)
Storage type
SD/SDHC/SDXC
SD/SDHC/SDXC
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless support
GPS
Battery model
NP-FZ100
LP-E17
Battery type
lithium-ion
lithium-ion
Weight
678g
485g
Body size
128.9 x 96.4 x 77.5 mm
132.5 x 85 x 70 mm
Released
2019
2019


Compare various cameras

vs

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Sony Alpha a9 II diagonal

w = 35.60 mm
h = 23.80 mm
Diagonal =  35.60² + 23.80²   = 42.82 mm

Canon RP diagonal

w = 35.90 mm
h = 24.00 mm
Diagonal =  35.90² + 24.00²   = 43.18 mm


Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

Alpha a9 II sensor area

Width = 35.60 mm
Height = 23.80 mm

Surface area = 35.60 × 23.80 = 847.28 mm²

RP sensor area

Width = 35.90 mm
Height = 24.00 mm

Surface area = 35.90 × 24.00 = 861.60 mm²


Pixel pitch

Pixel pitch is the distance from the center of one pixel to the center of the next measured in micrometers (µm). It can be calculated with the following formula:
Pixel pitch =   sensor width in mm  × 1000
sensor resolution width in pixels

Alpha a9 II pixel pitch

Sensor width = 35.60 mm
Sensor resolution width = 6026 pixels
Pixel pitch =   35.60  × 1000  = 5.91 µm
6026

RP pixel pitch

Sensor width = 35.90 mm
Sensor resolution width = 6269 pixels
Pixel pitch =   35.90  × 1000  = 5.73 µm
6269


Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:
Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:
Pixel area =   sensor surface area in mm²
effective megapixels

Alpha a9 II pixel area

Pixel pitch = 5.91 µm

Pixel area = 5.91² = 34.93 µm²

RP pixel area

Pixel pitch = 5.73 µm

Pixel area = 5.73² = 32.83 µm²


Pixel density

Pixel density can be calculated with the following formula:
Pixel density =  ( sensor resolution width in pixels)² / 1000000
sensor width in cm

One could also use this formula:
Pixel density =   effective megapixels × 1000000 / 10000
sensor surface area in mm²

Alpha a9 II pixel density

Sensor resolution width = 6026 pixels
Sensor width = 3.56 cm

Pixel density = (6026 / 3.56)² / 1000000 = 2.87 MP/cm²

RP pixel density

Sensor resolution width = 6269 pixels
Sensor width = 3.59 cm

Pixel density = (6269 / 3.59)² / 1000000 = 3.05 MP/cm²


Sensor resolution

Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher than maximum (not interpolated) image resolution which is usually stated on camera specifications. Sensor resolution is used in pixel pitch, pixel area, and pixel density formula. For sake of simplicity, we're going to calculate it in 3 stages.

1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.

2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
(X × r) × X = effective megapixels × 1000000    →   
X =  effective megapixels × 1000000
r
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

Alpha a9 II sensor resolution

Sensor width = 35.60 mm
Sensor height = 23.80 mm
Effective megapixels = 24.20
r = 35.60/23.80 = 1.5
X =  24.20 × 1000000  = 4017
1.5
Resolution horizontal: X × r = 4017 × 1.5 = 6026
Resolution vertical: X = 4017

Sensor resolution = 6026 x 4017

RP sensor resolution

Sensor width = 35.90 mm
Sensor height = 24.00 mm
Effective megapixels = 26.20
r = 35.90/24.00 = 1.5
X =  26.20 × 1000000  = 4179
1.5
Resolution horizontal: X × r = 4179 × 1.5 = 6269
Resolution vertical: X = 4179

Sensor resolution = 6269 x 4179


Crop factor

Crop factor or focal length multiplier is calculated by dividing the diagonal of 35 mm film (43.27 mm) with the diagonal of the sensor.
Crop factor =   43.27 mm
sensor diagonal in mm


Alpha a9 II crop factor

Sensor diagonal in mm = 42.82 mm
Crop factor =   43.27  = 1.01
42.82

RP crop factor

Sensor diagonal in mm = 43.18 mm
Crop factor =   43.27  = 1
43.18

35 mm equivalent aperture

Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier).

Alpha a9 II equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Sony Alpha a9 II, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony Alpha a9 II is 1.01

RP equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Canon RP, take the aperture of the lens you're using and multiply it with crop factor.

Since crop factor for Canon RP is 1, the equivalent aperture is aperture.

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