Minolta DiMAGE 7Hi vs. Olympus E-20
Comparison
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| Minolta DiMAGE 7Hi | Olympus E-20 | ||||
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Megapixels
5.24
4.90
Max. image resolution
2560 x 1920
2560 x 1920
Sensor
Sensor type
CCD
CCD
Sensor size
2/3" (~ 8.8 x 6.6 mm)
2/3" (~ 8.8 x 6.6 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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| Minolta DiMAGE 7Hi | Olympus E-20 | |
Surface area:
| 58.08 mm² | vs | 58.08 mm² |
Difference: 0 mm² (0%)
DiMAGE 7Hi and E-20 sensors are the same size.
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: 0.81 µm² (7%)
A pixel on Olympus E-20 sensor is approx. 7% bigger than a pixel on Minolta DiMAGE 7Hi.
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
Minolta DiMAGE 7Hi
Olympus E-20
Total megapixels
5.20
Effective megapixels
4.90
Optical zoom
7.1x
4x
Digital zoom
Yes
No
ISO sensitivity
100, 200, 400, 800
80, 160, 320
RAW
Manual focus
Normal focus range
60 cm
60 cm
Macro focus range
20 cm
20 cm
Focal length (35mm equiv.)
28 - 200 mm
35 - 140 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f3.5
f2.0 - f11.0
Metering
Centre weighted, Matrix, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
Bulb+30 sec
60 sec
Max. shutter speed
1/4000 sec
1/640 sec
Built-in flash
External flash
Viewfinder
Electronic
Optical (tunnel)
White balance presets
7
5
Screen size
1.8"
1.8"
Screen resolution
122,000 dots
118,000 dots
Video capture
Max. video resolution
Storage types
CompactFlash type I, CompactFlash type II, Microdrive
SmartMedia, Compact Flash Type I or II
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion (NP-200)
AA (2) batteries (NiMH recommended)
Weight
650 g
1190 g
Dimensions
117 x 91 x 113 mm
129 x 161 x 104 mm
Year
2002
2001
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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 |
Minolta DiMAGE 7Hi diagonal
The diagonal of DiMAGE 7Hi sensor is not 2/3 or 0.67" (16.9 mm) as you might expect, but approximately two thirds of
that value - 11 mm. If you want to know why, see
sensor sizes.
w = 8.80 mm
h = 6.60 mm
w = 8.80 mm
h = 6.60 mm
| Diagonal = √ | 8.80² + 6.60² | = 11.00 mm |
Olympus E-20 diagonal
The diagonal of E-20 sensor is not 2/3 or 0.67" (16.9 mm) as you might expect, but approximately two thirds of
that value - 11 mm. If you want to know why, see
sensor sizes.
w = 8.80 mm
h = 6.60 mm
w = 8.80 mm
h = 6.60 mm
| Diagonal = √ | 8.80² + 6.60² | = 11.00 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
DiMAGE 7Hi sensor area
Width = 8.80 mm
Height = 6.60 mm
Surface area = 8.80 × 6.60 = 58.08 mm²
Height = 6.60 mm
Surface area = 8.80 × 6.60 = 58.08 mm²
E-20 sensor area
Width = 8.80 mm
Height = 6.60 mm
Surface area = 8.80 × 6.60 = 58.08 mm²
Height = 6.60 mm
Surface area = 8.80 × 6.60 = 58.08 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 |
DiMAGE 7Hi pixel pitch
Sensor width = 8.80 mm
Sensor resolution width = 2640 pixels
Sensor resolution width = 2640 pixels
| Pixel pitch = | 8.80 | × 1000 | = 3.33 µm |
| 2640 |
E-20 pixel pitch
Sensor width = 8.80 mm
Sensor resolution width = 2552 pixels
Sensor resolution width = 2552 pixels
| Pixel pitch = | 8.80 | × 1000 | = 3.45 µm |
| 2552 |
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 |
DiMAGE 7Hi pixel area
Pixel pitch = 3.33 µm
Pixel area = 3.33² = 11.09 µm²
Pixel area = 3.33² = 11.09 µm²
E-20 pixel area
Pixel pitch = 3.45 µm
Pixel area = 3.45² = 11.9 µm²
Pixel area = 3.45² = 11.9 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 |
DiMAGE 7Hi pixel density
Sensor resolution width = 2640 pixels
Sensor width = 0.88 cm
Pixel density = (2640 / 0.88)² / 1000000 = 9 MP/cm²
Sensor width = 0.88 cm
Pixel density = (2640 / 0.88)² / 1000000 = 9 MP/cm²
E-20 pixel density
Sensor resolution width = 2552 pixels
Sensor width = 0.88 cm
Pixel density = (2552 / 0.88)² / 1000000 = 8.41 MP/cm²
Sensor width = 0.88 cm
Pixel density = (2552 / 0.88)² / 1000000 = 8.41 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
DiMAGE 7Hi sensor resolution
Sensor width = 8.80 mm
Sensor height = 6.60 mm
Effective megapixels = 5.24
Resolution horizontal: X × r = 1985 × 1.33 = 2640
Resolution vertical: X = 1985
Sensor resolution = 2640 x 1985
Sensor height = 6.60 mm
Effective megapixels = 5.24
| r = 8.80/6.60 = 1.33 |
|
Resolution vertical: X = 1985
Sensor resolution = 2640 x 1985
E-20 sensor resolution
Sensor width = 8.80 mm
Sensor height = 6.60 mm
Effective megapixels = 4.90
Resolution horizontal: X × r = 1919 × 1.33 = 2552
Resolution vertical: X = 1919
Sensor resolution = 2552 x 1919
Sensor height = 6.60 mm
Effective megapixels = 4.90
| r = 8.80/6.60 = 1.33 |
|
Resolution vertical: X = 1919
Sensor resolution = 2552 x 1919
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 |
DiMAGE 7Hi crop factor
Sensor diagonal in mm = 11.00 mm
| Crop factor = | 43.27 | = 3.93 |
| 11.00 |
E-20 crop factor
Sensor diagonal in mm = 11.00 mm
| Crop factor = | 43.27 | = 3.93 |
| 11.00 |
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).
DiMAGE 7Hi equivalent aperture
Crop factor = 3.93
Aperture = f2.8 - f3.5
35-mm equivalent aperture = (f2.8 - f3.5) × 3.93 = f11 - f13.8
Aperture = f2.8 - f3.5
35-mm equivalent aperture = (f2.8 - f3.5) × 3.93 = f11 - f13.8
E-20 equivalent aperture
Crop factor = 3.93
Aperture = f2.0 - f11.0
35-mm equivalent aperture = (f2.0 - f11.0) × 3.93 = f7.9 - f43.2
Aperture = f2.0 - f11.0
35-mm equivalent aperture = (f2.0 - f11.0) × 3.93 = f7.9 - f43.2
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