Kodak EasyShare Z915 vs. Sony Cyber-shot DSC-RX1

Comparison

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EasyShare Z915 image
vs
Cyber-shot DSC-RX1 image
Kodak EasyShare Z915 Sony Cyber-shot DSC-RX1
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Megapixels
10.00
24.30
Max. image resolution
3648 x 2736
6000 x 4000

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
35.8 x 23.9 mm
Sensor resolution
3647 x 2742
6038 x 4025
Diagonal
7.70 mm
43.04 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
1 : 30.06
(ratio)
Kodak EasyShare Z915 Sony Cyber-shot DSC-RX1
Surface area:
28.46 mm² vs 855.62 mm²
Difference: 827.16 mm² (2906%)
RX1 sensor is approx. 30.06x bigger than Z915 sensor.
Note: You are comparing cameras of different generations. There is a 3 year gap between Kodak Z915 (2009) and Sony RX1 (2012). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.69 µm
5.93 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: 4.24 µm (251%)
Pixel pitch of RX1 is approx. 251% higher than pixel pitch of Z915.
Pixel area
2.86 µm²
35.16 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: 32.3 µm² (1129%)
A pixel on Sony RX1 sensor is approx. 1129% bigger than a pixel on Kodak Z915.
Pixel density
35.05 MP/cm²
2.84 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: 32.21 µm (1134%)
Kodak Z915 has approx. 1134% higher pixel density than Sony RX1.
To learn about the accuracy of these numbers, click here.

Specs

Kodak Z915
Sony RX1
Crop factor
5.62
1.01
Total megapixels
24.70
Effective megapixels
10.00
24.30
Optical zoom
10x
1x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600
RAW
Manual focus
Normal focus range
60 cm
25 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
35 - 350 mm
35 mm
Aperture priority
Yes
Yes
Max. aperture
f3.5 - f4.8
f2.0
Max. aperture (35mm equiv.)
f19.7 - f27
f2
Metering
Centre weighted, Multi-pattern, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
16 sec
30 sec
Max. shutter speed
1/1250 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Electronic and Optical (optional)
White balance presets
5
9
Screen size
2.5"
3"
Screen resolution
230,000 dots
1,229,000 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
2 x AA batteries (NiMH)
Lithium-Ion NP-BX1 battery
Weight
220 g
482 g
Dimensions
107 x 72.4 x 35.7 mm
113 x 65 x 70 mm
Year
2009
2012



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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

Kodak Z915 diagonal

The diagonal of Z915 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal =  6.16² + 4.62²   = 7.70 mm

Sony RX1 diagonal

w = 35.80 mm
h = 23.90 mm
Diagonal =  35.80² + 23.90²   = 43.04 mm


Surface area

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

Z915 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

RX1 sensor area

Width = 35.80 mm
Height = 23.90 mm

Surface area = 35.80 × 23.90 = 855.62 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

Z915 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3647 pixels
Pixel pitch =   6.16  × 1000  = 1.69 µm
3647

RX1 pixel pitch

Sensor width = 35.80 mm
Sensor resolution width = 6038 pixels
Pixel pitch =   35.80  × 1000  = 5.93 µm
6038


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

Z915 pixel area

Pixel pitch = 1.69 µm

Pixel area = 1.69² = 2.86 µm²

RX1 pixel area

Pixel pitch = 5.93 µm

Pixel area = 5.93² = 35.16 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

Z915 pixel density

Sensor resolution width = 3647 pixels
Sensor width = 0.616 cm

Pixel density = (3647 / 0.616)² / 1000000 = 35.05 MP/cm²

RX1 pixel density

Sensor resolution width = 6038 pixels
Sensor width = 3.58 cm

Pixel density = (6038 / 3.58)² / 1000000 = 2.84 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

Z915 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 10.00
r = 6.16/4.62 = 1.33
X =  10.00 × 1000000  = 2742
1.33
Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742

Sensor resolution = 3647 x 2742

RX1 sensor resolution

Sensor width = 35.80 mm
Sensor height = 23.90 mm
Effective megapixels = 24.30
r = 35.80/23.90 = 1.5
X =  24.30 × 1000000  = 4025
1.5
Resolution horizontal: X × r = 4025 × 1.5 = 6038
Resolution vertical: X = 4025

Sensor resolution = 6038 x 4025


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


Z915 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

RX1 crop factor

Sensor diagonal in mm = 43.04 mm
Crop factor =   43.27  = 1.01
43.04

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).

Z915 equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f4.8

35-mm equivalent aperture = (f3.5 - f4.8) × 5.62 = f19.7 - f27

RX1 equivalent aperture

Crop factor = 1.01
Aperture = f2.0

35-mm equivalent aperture = (f2.0) × 1.01 = f2

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