Sony Cyber-shot DSC-D770 vs. Sony Mavica CD400
Comparison
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| Sony Cyber-shot DSC-D770 | Sony Mavica CD400 | ||||
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Megapixels
1.40
3.90
Max. image resolution
1344 x 1024
2272 x 1704
Sensor
Sensor type
CCD
CCD
Sensor size
1/2" (~ 6.4 x 4.8 mm)
1/1.8" (~ 7.11 x 5.33 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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| Sony Cyber-shot DSC-D770 | Sony Mavica CD400 | |
Surface area:
| 30.72 mm² | vs | 37.90 mm² |
Difference: 7.18 mm² (23%)
Mavica CD400 sensor is approx. 1.23x bigger than D770 sensor.
Note: You are comparing cameras of different generations.
There is a 3 year gap between Sony D770 (1999) and Sony Mavica CD400 (2002).
All things being equal, newer sensor generations generally outperform the older.
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: 12.27 µm² (126%)
A pixel on Sony D770 sensor is approx. 126% bigger than a pixel on Sony Mavica CD400.
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
Sony D770
Sony Mavica CD400
Total megapixels
4.10
Effective megapixels
3.90
Optical zoom
5x
3x
Digital zoom
Yes
Yes
ISO sensitivity
50, 100, 400
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
20 cm
50 cm
Macro focus range
8 cm
4 cm
Focal length (35mm equiv.)
28 - 140 mm
34 - 102 mm
Aperture priority
Yes
Yes
Max. aperture
f2.0 - f2.4
f2.0 - f2.5
Metering
Multi, Center-weighted, Spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/4 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
No
Min. shutter speed
4 sec
8 sec
Max. shutter speed
1/2000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
Electronic
None
White balance presets
3
7
Screen size
2.5"
2.5"
Screen resolution
180,000 dots
123,000 dots
Video capture
Max. video resolution
Storage types
PCMCIA (type II), Memory Stick
8cm CDR, 8cm CDRW
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
InfoLithium (NP-F550)
InfoLithium (NP-FM50)
Weight
900 g
640 g
Dimensions
130 x 100 x 150 mm
138 x 95 x 101 mm
Year
1999
2002
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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 |
Sony D770 diagonal
The diagonal of D770 sensor is not 1/2 or 0.5" (12.7 mm) as you might expect, but approximately two thirds of
that value - 8 mm. If you want to know why, see
sensor sizes.
w = 6.40 mm
h = 4.80 mm
w = 6.40 mm
h = 4.80 mm
| Diagonal = √ | 6.40² + 4.80² | = 8.00 mm |
Sony Mavica CD400 diagonal
The diagonal of Mavica CD400 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
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.
D770 sensor area
Width = 6.40 mm
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
Mavica CD400 sensor area
Width = 7.11 mm
Height = 5.33 mm
Surface area = 7.11 × 5.33 = 37.90 mm²
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 |
D770 pixel pitch
Sensor width = 6.40 mm
Sensor resolution width = 1365 pixels
Sensor resolution width = 1365 pixels
| Pixel pitch = | 6.40 | × 1000 | = 4.69 µm |
| 1365 |
Mavica CD400 pixel pitch
Sensor width = 7.11 mm
Sensor resolution width = 2277 pixels
Sensor resolution width = 2277 pixels
| Pixel pitch = | 7.11 | × 1000 | = 3.12 µm |
| 2277 |
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 |
D770 pixel area
Pixel pitch = 4.69 µm
Pixel area = 4.69² = 22 µm²
Pixel area = 4.69² = 22 µm²
Mavica CD400 pixel area
Pixel pitch = 3.12 µm
Pixel area = 3.12² = 9.73 µm²
Pixel area = 3.12² = 9.73 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 |
D770 pixel density
Sensor resolution width = 1365 pixels
Sensor width = 0.64 cm
Pixel density = (1365 / 0.64)² / 1000000 = 4.55 MP/cm²
Sensor width = 0.64 cm
Pixel density = (1365 / 0.64)² / 1000000 = 4.55 MP/cm²
Mavica CD400 pixel density
Sensor resolution width = 2277 pixels
Sensor width = 0.711 cm
Pixel density = (2277 / 0.711)² / 1000000 = 10.26 MP/cm²
Sensor width = 0.711 cm
Pixel density = (2277 / 0.711)² / 1000000 = 10.26 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
D770 sensor resolution
Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 1.40
Resolution horizontal: X × r = 1026 × 1.33 = 1365
Resolution vertical: X = 1026
Sensor resolution = 1365 x 1026
Sensor height = 4.80 mm
Effective megapixels = 1.40
| r = 6.40/4.80 = 1.33 |
|
Resolution vertical: X = 1026
Sensor resolution = 1365 x 1026
Mavica CD400 sensor resolution
Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.90
Resolution horizontal: X × r = 1712 × 1.33 = 2277
Resolution vertical: X = 1712
Sensor resolution = 2277 x 1712
Sensor height = 5.33 mm
Effective megapixels = 3.90
| r = 7.11/5.33 = 1.33 |
|
Resolution vertical: X = 1712
Sensor resolution = 2277 x 1712
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 |
D770 crop factor
Sensor diagonal in mm = 8.00 mm
| Crop factor = | 43.27 | = 5.41 |
| 8.00 |
Mavica CD400 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).
D770 equivalent aperture
Crop factor = 5.41
Aperture = f2.0 - f2.4
35-mm equivalent aperture = (f2.0 - f2.4) × 5.41 = f10.8 - f13
Aperture = f2.0 - f2.4
35-mm equivalent aperture = (f2.0 - f2.4) × 5.41 = f10.8 - f13
Mavica CD400 equivalent aperture
Crop factor = 4.87
Aperture = f2.0 - f2.5
35-mm equivalent aperture = (f2.0 - f2.5) × 4.87 = f9.7 - f12.2
Aperture = f2.0 - f2.5
35-mm equivalent aperture = (f2.0 - f2.5) × 4.87 = f9.7 - f12.2
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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.