Canon EOS R7 vs. HP Photosmart 945

Comparison

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EOS R7 image
vs
Photosmart 945 image
Canon EOS R7 HP Photosmart 945
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Megapixels
32.50
5.10
Max. image resolution
6960 x 4640
2608 x 1952

Sensor

Sensor type
CMOS
CCD
Sensor size
22.3 x 14.9 mm
1/1.8" (~ 7.11 x 5.33 mm)
Sensor resolution
6983 x 4655
2604 x 1958
Diagonal
26.82 mm
8.89 mm
Sensor size comparison
Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality.

Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.

Learn more about sensor sizes »

Actual sensor size

Note: Actual size is set to screen → change »
vs
8.77 : 1
(ratio)
Canon EOS R7 HP Photosmart 945
Surface area:
332.27 mm² vs 37.90 mm²
Difference: 294.37 mm² (777%)
R7 sensor is approx. 8.77x bigger than 945 sensor.
Note: You are comparing sensors of vastly different generations. There is a gap of 19 years between Canon R7 (2022) and HP 945 (2003). Nineteen years is a huge amount of time, technology wise, resulting in newer sensor being much more efficient than the older one.
Pixel pitch
3.19 µm
2.73 µm
Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.

The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.
Difference: 0.46 µm (17%)
Pixel pitch of R7 is approx. 17% higher than pixel pitch of 945.
Pixel area
10.18 µm²
7.45 µm²
Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel.

Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.
Relative pixel sizes:
vs
Pixel area difference: 2.73 µm² (37%)
A pixel on Canon R7 sensor is approx. 37% bigger than a pixel on HP 945.
Pixel density
9.81 MP/cm²
13.41 MP/cm²
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor.

Higher pixel density means smaller pixels and lower pixel density means larger pixels.
Difference: 3.6 µm (37%)
HP 945 has approx. 37% higher pixel density than Canon R7.
To learn about the accuracy of these numbers, click here.



Specs

Canon R7
HP 945
Crop factor
1.61
4.87
Total megapixels
34.40
Effective megapixels
32.50
Optical zoom
 
8.1x
Digital zoom
Yes
ISO sensitivity
Auto, 100-32000 (extends to 51200)
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
37 - 300 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f3.1
Max. aperture (35mm equiv.)
n/a
f13.6 - f15.1
Metering
Multi, Center-weighted, Spot, Partial
Centre weighted, Matrix, Spot
Exposure compensation
±3 EV (in 1/3 EV, 1/2 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
30 sec
16 sec
Max. shutter speed
1/8000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Electronic
Electronic
White balance presets
6
6
Screen size
3"
2"
Screen resolution
1,620,000 dots
180,000 dots
Video capture
Max. video resolution
3840x2160 (60p/​30p/​23.98p)
Storage types
SD/SDHC/SDXC, UHS-II
MultiMedia, Secure Digital
USB
USB 3.0 (5 GBit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
LP-E6NH lithium-ion battery
AA (4) batteries (NiMH recommended)
Weight
612 g
400 g
Dimensions
132 x 90.4 x 91.7 mm
123 x 85 x 85 mm
Year
2022
2003




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Diagonal

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

Canon R7 diagonal

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

HP 945 diagonal

The diagonal of 945 sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm
Diagonal =  7.11² + 5.33²   = 8.89 mm


Surface area

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

R7 sensor area

Width = 22.30 mm
Height = 14.90 mm

Surface area = 22.30 × 14.90 = 332.27 mm²

945 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 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

R7 pixel pitch

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

945 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2604 pixels
Pixel pitch =   7.11  × 1000  = 2.73 µm
2604


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

R7 pixel area

Pixel pitch = 3.19 µm

Pixel area = 3.19² = 10.18 µm²

945 pixel area

Pixel pitch = 2.73 µm

Pixel area = 2.73² = 7.45 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

R7 pixel density

Sensor resolution width = 6983 pixels
Sensor width = 2.23 cm

Pixel density = (6983 / 2.23)² / 1000000 = 9.81 MP/cm²

945 pixel density

Sensor resolution width = 2604 pixels
Sensor width = 0.711 cm

Pixel density = (2604 / 0.711)² / 1000000 = 13.41 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

R7 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

945 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 5.10
r = 7.11/5.33 = 1.33
X =  5.10 × 1000000  = 1958
1.33
Resolution horizontal: X × r = 1958 × 1.33 = 2604
Resolution vertical: X = 1958

Sensor resolution = 2604 x 1958


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


R7 crop factor

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

945 crop factor

Sensor diagonal in mm = 8.89 mm
Crop factor =   43.27  = 4.87
8.89

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).

R7 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 R7, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon R7 is 1.61

945 equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f3.1

35-mm equivalent aperture = (f2.8 - f3.1) × 4.87 = f13.6 - f15.1

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