Sony Cyber-shot DSC-T99 vs. Olympus OM-D E-M1

Comparison

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Cyber-shot DSC-T99 image
vs
OM-D E-M1 image
Sony Cyber-shot DSC-T99 Olympus OM-D E-M1
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Megapixels
14.10
16.30
Max. image resolution
4320 x 3240
4608 x 3456

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
Four Thirds (17.3 x 13 mm)
Sensor resolution
4330 x 3256
4656 x 3501
Diagonal
7.70 mm
21.64 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

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vs
1 : 7.9
(ratio)
Sony Cyber-shot DSC-T99 Olympus OM-D E-M1
Surface area:
28.46 mm² vs 224.90 mm²
Difference: 196.44 mm² (690%)
OM-D E-M1 sensor is approx. 7.9x bigger than T99 sensor.
Note: You are comparing cameras of different generations. There is a 3 year gap between Sony T99 (2010) and Olympus OM-D E-M1 (2013). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.42 µm
3.72 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: 2.3 µm (162%)
Pixel pitch of OM-D E-M1 is approx. 162% higher than pixel pitch of T99.
Pixel area
2.02 µm²
13.84 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: 11.82 µm² (585%)
A pixel on Olympus OM-D E-M1 sensor is approx. 585% bigger than a pixel on Sony T99.
Pixel density
49.41 MP/cm²
7.24 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: 42.17 µm (582%)
Sony T99 has approx. 582% higher pixel density than Olympus OM-D E-M1.
To learn about the accuracy of these numbers, click here.



Specs

Sony T99
Olympus OM-D E-M1
Crop factor
5.62
2
Total megapixels
16.80
Effective megapixels
16.30
Optical zoom
4x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80-3200
100 - 25600
RAW
Manual focus
Normal focus range
1 cm
Macro focus range
1 cm
Focal length (35mm equiv.)
25 - 100 mm
Aperture priority
No
Yes
Max. aperture
f3.5 - f4.6
Max. aperture (35mm equiv.)
f19.7 - f25.9
n/a
Metering
Centre weighted, Matrix, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV, 1 EV steps)
Shutter priority
No
Yes
Min. shutter speed
2 sec
60 sec
Max. shutter speed
1/1250 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
Electronic
White balance presets
7
7
Screen size
3"
3"
Screen resolution
230,400 dots
1,037,000 dots
Video capture
Max. video resolution
Storage types
Memory Stick Duo, Memory Stick Pro Duo, SDHC, Secure Digital
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NP-BN1 rechargeable battery
BLN-1 Li-ion
Weight
121 g
497 g
Dimensions
93 x 56 x 17 mm
130.4 x 93.5 x 63.1 mm
Year
2010
2013




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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 T99 diagonal

The diagonal of T99 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

Olympus OM-D E-M1 diagonal

w = 17.30 mm
h = 13.00 mm
Diagonal =  17.30² + 13.00²   = 21.64 mm


Surface area

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

T99 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

OM-D E-M1 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 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

T99 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4330 pixels
Pixel pitch =   6.16  × 1000  = 1.42 µm
4330

OM-D E-M1 pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 4656 pixels
Pixel pitch =   17.30  × 1000  = 3.72 µm
4656


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

T99 pixel area

Pixel pitch = 1.42 µm

Pixel area = 1.42² = 2.02 µm²

OM-D E-M1 pixel area

Pixel pitch = 3.72 µm

Pixel area = 3.72² = 13.84 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

T99 pixel density

Sensor resolution width = 4330 pixels
Sensor width = 0.616 cm

Pixel density = (4330 / 0.616)² / 1000000 = 49.41 MP/cm²

OM-D E-M1 pixel density

Sensor resolution width = 4656 pixels
Sensor width = 1.73 cm

Pixel density = (4656 / 1.73)² / 1000000 = 7.24 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

T99 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.10
r = 6.16/4.62 = 1.33
X =  14.10 × 1000000  = 3256
1.33
Resolution horizontal: X × r = 3256 × 1.33 = 4330
Resolution vertical: X = 3256

Sensor resolution = 4330 x 3256

OM-D E-M1 sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 16.30
r = 17.30/13.00 = 1.33
X =  16.30 × 1000000  = 3501
1.33
Resolution horizontal: X × r = 3501 × 1.33 = 4656
Resolution vertical: X = 3501

Sensor resolution = 4656 x 3501


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


T99 crop factor

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

OM-D E-M1 crop factor

Sensor diagonal in mm = 21.64 mm
Crop factor =   43.27  = 2
21.64

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).

T99 equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f4.6

35-mm equivalent aperture = (f3.5 - f4.6) × 5.62 = f19.7 - f25.9

OM-D E-M1 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 Olympus OM-D E-M1, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Olympus OM-D E-M1 is 2

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