Epson PhotoPC 650 vs. Sony Cyber-shot DSC-W690
Comparison
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| Epson PhotoPC 650 | Sony Cyber-shot DSC-W690 | ||||
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Megapixels
0.90
16.10
Max. image resolution
1152 x 864
4608 x 3456
Sensor
Sensor type
CCD
CCD
Sensor size
1/3" (~ 4.8 x 3.6 mm)
1/2.3" (~ 6.16 x 4.62 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 »
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 »
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| Epson PhotoPC 650 | Sony Cyber-shot DSC-W690 | |
Surface area:
| 17.28 mm² | vs | 28.46 mm² |
Difference: 11.18 mm² (65%)
W690 sensor is approx. 1.65x bigger than 650 sensor.
Note: You are comparing sensors of vastly different generations.
There is a gap of 13 years between Epson 650 (1999) and
Sony W690 (2012).
Thirteen years is a huge amount of time,
technology wise, resulting in newer sensor being much more
efficient than the older one.
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.
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.
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.
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: 17.41 µm² (984%)
A pixel on Epson 650 sensor is approx. 984% bigger than a pixel on Sony W690.
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.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Epson 650
Sony W690
Total megapixels
Effective megapixels
Optical zoom
1x
10x
Digital zoom
Yes
Yes
ISO sensitivity
140
Auto
RAW
Manual focus
Normal focus range
60 cm
Macro focus range
15 cm
5 cm
Focal length (35mm equiv.)
39 mm
25 - 250 mm
Aperture priority
No
No
Max. aperture
f2.0 - f4.0
f3.3 - f5.9
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/2 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
1/4 sec
30 sec
Max. shutter speed
1/500 sec
1/1600 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
None
White balance presets
3
6
Screen size
1.8"
3"
Screen resolution
72,000 dots
230,400 dots
Video capture
Max. video resolution
Storage types
Compact Flash Type I
Memory Stick Duo, Memory Stick Pro Duo, SDHC, SDXC, Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
AA (4) batteries (NiMH recommended)
Lithium-Ion NP-BN battery
Weight
400 g
142 g
Dimensions
135 x 82 x 57 mm
94 x 56 x 22 mm
Year
1999
2012
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
| Diagonal = √ | w² + h² |
Epson 650 diagonal
The diagonal of 650 sensor is not 1/3 or 0.33" (8.5 mm) as you might expect, but approximately two thirds of
that value - 6 mm. If you want to know why, see
sensor sizes.
w = 4.80 mm
h = 3.60 mm
w = 4.80 mm
h = 3.60 mm
| Diagonal = √ | 4.80² + 3.60² | = 6.00 mm |
Sony W690 diagonal
The diagonal of W690 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
w = 6.16 mm
h = 4.62 mm
| Diagonal = √ | 6.16² + 4.62² | = 7.70 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
650 sensor area
Width = 4.80 mm
Height = 3.60 mm
Surface area = 4.80 × 3.60 = 17.28 mm²
Height = 3.60 mm
Surface area = 4.80 × 3.60 = 17.28 mm²
W690 sensor area
Width = 6.16 mm
Height = 4.62 mm
Surface area = 6.16 × 4.62 = 28.46 mm²
Height = 4.62 mm
Surface area = 6.16 × 4.62 = 28.46 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 |
650 pixel pitch
Sensor width = 4.80 mm
Sensor resolution width = 1095 pixels
Sensor resolution width = 1095 pixels
| Pixel pitch = | 4.80 | × 1000 | = 4.38 µm |
| 1095 |
W690 pixel pitch
Sensor width = 6.16 mm
Sensor resolution width = 4627 pixels
Sensor resolution width = 4627 pixels
| Pixel pitch = | 6.16 | × 1000 | = 1.33 µm |
| 4627 |
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
| Pixel area = | sensor surface area in mm² |
| effective megapixels |
650 pixel area
Pixel pitch = 4.38 µm
Pixel area = 4.38² = 19.18 µm²
Pixel area = 4.38² = 19.18 µm²
W690 pixel area
Pixel pitch = 1.33 µm
Pixel area = 1.33² = 1.77 µm²
Pixel area = 1.33² = 1.77 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this 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 |
650 pixel density
Sensor resolution width = 1095 pixels
Sensor width = 0.48 cm
Pixel density = (1095 / 0.48)² / 1000000 = 5.2 MP/cm²
Sensor width = 0.48 cm
Pixel density = (1095 / 0.48)² / 1000000 = 5.2 MP/cm²
W690 pixel density
Sensor resolution width = 4627 pixels
Sensor width = 0.616 cm
Pixel density = (4627 / 0.616)² / 1000000 = 56.42 MP/cm²
Sensor width = 0.616 cm
Pixel density = (4627 / 0.616)² / 1000000 = 56.42 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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → |
|
Resolution horizontal: X × r
Resolution vertical: X
650 sensor resolution
Sensor width = 4.80 mm
Sensor height = 3.60 mm
Effective megapixels = 0.90
Resolution horizontal: X × r = 823 × 1.33 = 1095
Resolution vertical: X = 823
Sensor resolution = 1095 x 823
Sensor height = 3.60 mm
Effective megapixels = 0.90
| r = 4.80/3.60 = 1.33 |
|
Resolution vertical: X = 823
Sensor resolution = 1095 x 823
W690 sensor resolution
Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.10
Resolution horizontal: X × r = 3479 × 1.33 = 4627
Resolution vertical: X = 3479
Sensor resolution = 4627 x 3479
Sensor height = 4.62 mm
Effective megapixels = 16.10
| r = 6.16/4.62 = 1.33 |
|
Resolution vertical: X = 3479
Sensor resolution = 4627 x 3479
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 |
650 crop factor
Sensor diagonal in mm = 6.00 mm
| Crop factor = | 43.27 | = 7.21 |
| 6.00 |
W690 crop factor
Sensor diagonal in mm = 7.70 mm
| Crop factor = | 43.27 | = 5.62 |
| 7.70 |
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).
650 equivalent aperture
Crop factor = 7.21
Aperture = f2.0 - f4.0
35-mm equivalent aperture = (f2.0 - f4.0) × 7.21 = f14.4 - f28.8
Aperture = f2.0 - f4.0
35-mm equivalent aperture = (f2.0 - f4.0) × 7.21 = f14.4 - f28.8
W690 equivalent aperture
Crop factor = 5.62
Aperture = f3.3 - f5.9
35-mm equivalent aperture = (f3.3 - f5.9) × 5.62 = f18.5 - f33.2
Aperture = f3.3 - f5.9
35-mm equivalent aperture = (f3.3 - f5.9) × 5.62 = f18.5 - f33.2
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If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.