Canon EOS 90D vs Canon EOS RP Comparison

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EOS 90D image
vs
EOS RP image
Canon EOS 90D Canon EOS RP
Megapixels
32.50
26.20
Image resolution
6960 x 4640
6240 x 4160

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.3 x 14.9 mm
35.9 x 24 mm
Sensor resolution
6983 x 4655
6269 x 4179
Diagonal
26.82 mm
43.18 mm
Compare sensor size:

Sensor Size

Actual size is set to screen
vs
1:2.59
(ratio)
Canon EOS 90D Canon EOS RP
Surface area:
332.27 mm² vs 861.60 mm²
Difference: 529.33 mm² (159%)
RP sensor is ~2.59x bigger than 90D's.
Pixel pitch
3.19 µm
5.73 µm
Difference: 2.54 µm (80%)
Pixel pitch of RP is ~80% higher than 90D's.
Pixel area
10.18 µm²
32.83 µm²
Relative pixel sizes:
vs
Pixel area difference: 22.65 µm² (222%)
Pixel on Canon RP sensor is ~222% bigger than Canon 90D's.
Pixel density
9.81 MP/cm²
3.05 MP/cm²
Difference: 6.76 µm (222%)
Canon 90D has ~222% higher pixel density than Canon RP's.

Specs

Canon 90D
Canon RP
Crop factor
1.61
1
Megapixels
34.40
27.10
Optical zoom
n/a
Digital zoom
n/a
ISO range
Auto, 100-25600 (expands to 51200)
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, Spot, Partial
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)
1/8000s
1/4000s
Built-in flash
External flash
Viewfinder type
Optical (pentaprism)
Electronic
White balance
6
6
Screen size
3"
3"
Screen resolution
1,040,000 dots
1,040,000 dots
Video available
Max. video resolution
3840x2160 (30p/‚Äč25p)
3840x2160 (25p/24p)
Storage type
SD/SDHC/SDXC
SD/SDHC/SDXC
USB Version
2.0 (480 Mbit/sec)
2.0 (480 Mbit/sec)
HDMI
Wireless support
GPS
Battery model
LP-E6N
LP-E17
Battery type
lithium-ion
lithium-ion
Weight
701g
485g
Body size
140.7 x 104.8 x 76.8 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

Canon 90D diagonal

w = 22.30 mm
h = 14.90 mm
Diagonal =  22.30² + 14.90²   = 26.82 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.

90D sensor area

Width = 22.30 mm
Height = 14.90 mm

Surface area = 22.30 × 14.90 = 332.27 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

90D pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 6983 pixels
Pixel pitch =   22.30  × 1000  = 3.19 µm
6983

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

90D pixel area

Pixel pitch = 3.19 µm

Pixel area = 3.19² = 10.18 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

90D pixel density

Sensor resolution width = 6983 pixels
Sensor width = 2.23 cm

Pixel density = (6983 / 2.23)² / 1000000 = 9.81 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

90D sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 32.50
r = 22.30/14.90 = 1.5
X =  32.50 × 1000000  = 4655
1.5
Resolution horizontal: X × r = 4655 × 1.5 = 6983
Resolution vertical: X = 4655

Sensor resolution = 6983 x 4655

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


90D crop factor

Sensor diagonal in mm = 26.82 mm
Crop factor =   43.27  = 1.61
26.82

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).

90D 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 90D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon 90D is 1.61

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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