Sony Cyber-shot DSC-F55 vs. Sony Cyber-shot DSC-D770

Comparison

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Cyber-shot DSC-F55 image
vs
Cyber-shot DSC-D770 image
Sony Cyber-shot DSC-F55 Sony Cyber-shot DSC-D770
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Megapixels
1.90
1.40
Max. image resolution
1600 x 1200
1344 x 1024

Sensor

Sensor type
CCD
CCD
Sensor size
1/2" (~ 6.4 x 4.8 mm)
1/2" (~ 6.4 x 4.8 mm)
Sensor resolution
1589 x 1195
1365 x 1026
Diagonal
8.00 mm
8.00 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 : 1
(ratio)
Sony Cyber-shot DSC-F55 Sony Cyber-shot DSC-D770
Surface area:
30.72 mm² vs 30.72 mm²
Difference: 0 mm² (0%)
F55 and D770 sensors are the same size.
Pixel pitch
4.03 µm
4.69 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: 0.66 µm (16%)
Pixel pitch of D770 is approx. 16% higher than pixel pitch of F55.
Pixel area
16.24 µm²
22 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: 5.76 µm² (35%)
A pixel on Sony D770 sensor is approx. 35% bigger than a pixel on Sony F55.
Pixel density
6.16 MP/cm²
4.55 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: 1.61 µm (35%)
Sony F55 has approx. 35% higher pixel density than Sony D770.
To learn about the accuracy of these numbers, click here.



Specs

Sony F55
Sony D770
Crop factor
5.41
5.41
Total megapixels
Effective megapixels
Optical zoom
1x
5x
Digital zoom
Yes
Yes
ISO sensitivity
50, 100, 400
RAW
Manual focus
Normal focus range
50 cm
20 cm
Macro focus range
10 cm
8 cm
Focal length (35mm equiv.)
37 mm
28 - 140 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f3.0
f2.0 - f2.4
Max. aperture (35mm equiv.)
f15.1 - f16.2
f10.8 - f13
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±1.5 EV (in 1/2 EV steps)
±2 EV (in 1/4 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/60 sec
4 sec
Max. shutter speed
1/750 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Electronic
White balance presets
4
3
Screen size
2"
2.5"
Screen resolution
123,000 dots
180,000 dots
Video capture
Max. video resolution
Storage types
Memory Stick
PCMCIA (type II), Memory Stick
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
InfoLithium (NP-FS11)
InfoLithium (NP-F550)
Weight
300 g
900 g
Dimensions
103 x 79 x 48 mm
130 x 100 x 150 mm
Year
1999
1999




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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

Sony F55 diagonal

The diagonal of F55 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
Diagonal = √  6.40² + 4.80²   = 8.00 mm

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
Diagonal = √  6.40² + 4.80²   = 8.00 mm


Surface area

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

F55 sensor area

Width = 6.40 mm
Height = 4.80 mm

Surface area = 6.40 × 4.80 = 30.72 mm²

D770 sensor area

Width = 6.40 mm
Height = 4.80 mm

Surface area = 6.40 × 4.80 = 30.72 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

F55 pixel pitch

Sensor width = 6.40 mm
Sensor resolution width = 1589 pixels
Pixel pitch =   6.40  × 1000  = 4.03 µm
1589

D770 pixel pitch

Sensor width = 6.40 mm
Sensor resolution width = 1365 pixels
Pixel pitch =   6.40  × 1000  = 4.69 µm
1365


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

F55 pixel area

Pixel pitch = 4.03 µm

Pixel area = 4.03² = 16.24 µm²

D770 pixel area

Pixel pitch = 4.69 µm

Pixel area = 4.69² = 22 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

F55 pixel density

Sensor resolution width = 1589 pixels
Sensor width = 0.64 cm

Pixel density = (1589 / 0.64)² / 1000000 = 6.16 MP/cm²

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 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

F55 sensor resolution

Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 1.90
r = 6.40/4.80 = 1.33
X = √  1.90 × 1000000  = 1195
1.33
Resolution horizontal: X × r = 1195 × 1.33 = 1589
Resolution vertical: X = 1195

Sensor resolution = 1589 x 1195

D770 sensor resolution

Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 1.40
r = 6.40/4.80 = 1.33
X = √  1.40 × 1000000  = 1026
1.33
Resolution horizontal: X × r = 1026 × 1.33 = 1365
Resolution vertical: X = 1026

Sensor resolution = 1365 x 1026


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


F55 crop factor

Sensor diagonal in mm = 8.00 mm
Crop factor =   43.27  = 5.41
8.00

D770 crop factor

Sensor diagonal in mm = 8.00 mm
Crop factor =   43.27  = 5.41
8.00

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).

F55 equivalent aperture

Crop factor = 5.41
Aperture = f2.8 - f3.0

35-mm equivalent aperture = (f2.8 - f3.0) × 5.41 = f15.1 - f16.2

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

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