Olympus C-840L vs. Sony Alpha DSLR-A230
Comparison
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| Olympus C-840L | Sony Alpha DSLR-A230 | ||||
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Megapixels
1.31
10.20
Max. image resolution
1280 x 960
3872 x 2592
Sensor
Sensor type
CCD
CCD
Sensor size
1/2.7" (~ 5.33 x 4 mm)
23.5 x 15.7 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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| 1 | : | 17.31 |
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| Olympus C-840L | Sony Alpha DSLR-A230 | |
Surface area:
| 21.32 mm² | vs | 368.95 mm² |
Difference: 347.63 mm² (1631%)
Alpha DSLR-A230 sensor is approx. 17.31x bigger than C-840L sensor.
Note: You are comparing sensors of very different generations.
There is a gap of 10 years between Olympus C-840L (1999) and Sony Alpha DSLR-A230 (2009).
Ten years is a lot of time in terms
of technology, meaning newer sensors are overall much more
efficient than the older ones.
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: 19.8 µm² (121%)
A pixel on Sony Alpha DSLR-A230 sensor is approx. 121% bigger than a pixel on Olympus C-840L.
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
Olympus C-840L
Sony Alpha DSLR-A230
Total megapixels
10.80
Effective megapixels
10.20
Optical zoom
No
Digital zoom
Yes
No
ISO sensitivity
60
Auto, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
36 mm
Aperture priority
No
Yes
Max. aperture
f2.8
Metering
Centre weighted
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/2 sec
30 sec
Max. shutter speed
1/500 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (pentamirror)
White balance presets
5
6
Screen size
1.8"
2.7"
Screen resolution
114,000 dots
230,400 dots
Video capture
Max. video resolution
Storage types
SmartMedia
SD/ SDHC, Memory Stick Pro Duo
USB
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
4x AA
Lithium-Ion NP-FH50 rechargeable battery
Weight
325 g
490 g
Dimensions
128 x 65 x 45 mm
128 x 97 x 68 mm
Year
1999
2009
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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 |
Olympus C-840L diagonal
The diagonal of C-840L sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of
that value - 6.66 mm. If you want to know why, see
sensor sizes.
w = 5.33 mm
h = 4.00 mm
w = 5.33 mm
h = 4.00 mm
| Diagonal = √ | 5.33² + 4.00² | = 6.66 mm |
Sony Alpha DSLR-A230 diagonal
w = 23.50 mm
h = 15.70 mm
h = 15.70 mm
| Diagonal = √ | 23.50² + 15.70² | = 28.26 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
C-840L sensor area
Width = 5.33 mm
Height = 4.00 mm
Surface area = 5.33 × 4.00 = 21.32 mm²
Height = 4.00 mm
Surface area = 5.33 × 4.00 = 21.32 mm²
Alpha DSLR-A230 sensor area
Width = 23.50 mm
Height = 15.70 mm
Surface area = 23.50 × 15.70 = 368.95 mm²
Height = 15.70 mm
Surface area = 23.50 × 15.70 = 368.95 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 |
C-840L pixel pitch
Sensor width = 5.33 mm
Sensor resolution width = 1319 pixels
Sensor resolution width = 1319 pixels
| Pixel pitch = | 5.33 | × 1000 | = 4.04 µm |
| 1319 |
Alpha DSLR-A230 pixel pitch
Sensor width = 23.50 mm
Sensor resolution width = 3912 pixels
Sensor resolution width = 3912 pixels
| Pixel pitch = | 23.50 | × 1000 | = 6.01 µm |
| 3912 |
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 |
C-840L pixel area
Pixel pitch = 4.04 µm
Pixel area = 4.04² = 16.32 µm²
Pixel area = 4.04² = 16.32 µm²
Alpha DSLR-A230 pixel area
Pixel pitch = 6.01 µm
Pixel area = 6.01² = 36.12 µm²
Pixel area = 6.01² = 36.12 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 |
C-840L pixel density
Sensor resolution width = 1319 pixels
Sensor width = 0.533 cm
Pixel density = (1319 / 0.533)² / 1000000 = 6.12 MP/cm²
Sensor width = 0.533 cm
Pixel density = (1319 / 0.533)² / 1000000 = 6.12 MP/cm²
Alpha DSLR-A230 pixel density
Sensor resolution width = 3912 pixels
Sensor width = 2.35 cm
Pixel density = (3912 / 2.35)² / 1000000 = 2.77 MP/cm²
Sensor width = 2.35 cm
Pixel density = (3912 / 2.35)² / 1000000 = 2.77 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
C-840L sensor resolution
Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 1.31
Resolution horizontal: X × r = 992 × 1.33 = 1319
Resolution vertical: X = 992
Sensor resolution = 1319 x 992
Sensor height = 4.00 mm
Effective megapixels = 1.31
| r = 5.33/4.00 = 1.33 |
|
Resolution vertical: X = 992
Sensor resolution = 1319 x 992
Alpha DSLR-A230 sensor resolution
Sensor width = 23.50 mm
Sensor height = 15.70 mm
Effective megapixels = 10.20
Resolution horizontal: X × r = 2608 × 1.5 = 3912
Resolution vertical: X = 2608
Sensor resolution = 3912 x 2608
Sensor height = 15.70 mm
Effective megapixels = 10.20
| r = 23.50/15.70 = 1.5 |
|
Resolution vertical: X = 2608
Sensor resolution = 3912 x 2608
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 |
C-840L crop factor
Sensor diagonal in mm = 6.66 mm
| Crop factor = | 43.27 | = 6.5 |
| 6.66 |
Alpha DSLR-A230 crop factor
Sensor diagonal in mm = 28.26 mm
| Crop factor = | 43.27 | = 1.53 |
| 28.26 |
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).
C-840L equivalent aperture
Crop factor = 6.5
Aperture = f2.8
35-mm equivalent aperture = (f2.8) × 6.5 = f18.2
Aperture = f2.8
35-mm equivalent aperture = (f2.8) × 6.5 = f18.2
Alpha DSLR-A230 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
Sony Alpha DSLR-A230, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Sony Alpha DSLR-A230 is 1.53
Crop factor for Sony Alpha DSLR-A230 is 1.53
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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.