Fujifilm DS-260HD vs. Pentax K20D
Comparison
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| Fujifilm DS-260HD | Pentax K20D | ||||
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Megapixels
1.30
14.60
Max. image resolution
1280 x 1024
4672 x 3120
Sensor
Sensor type
CCD
CMOS
Sensor size
1/2" (~ 6.4 x 4.8 mm)
23.4 x 15.6 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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| 1 | : | 11.88 |
| (ratio) | ||
| Fujifilm DS-260HD | Pentax K20D | |
Surface area:
| 30.72 mm² | vs | 365.04 mm² |
Difference: 334.32 mm² (1088%)
K20D sensor is approx. 11.88x bigger than DS-260HD sensor.
Note: You are comparing sensors of very different generations.
There is a gap of 9 years between Fujifilm DS-260HD (1999) and Pentax K20D (2008).
Nine 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: 1.28 µm² (5%)
A pixel on Pentax K20D sensor is approx. 5% bigger than a pixel on Fujifilm DS-260HD.
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
Fujifilm DS-260HD
Pentax K20D
Total megapixels
1.50
15.10
Effective megapixels
1.30
14.60
Optical zoom
3x
Digital zoom
No
No
ISO sensitivity
100
Auto, 100 - 6400
RAW
Manual focus
Normal focus range
90 cm
Macro focus range
25 cm
Focal length (35mm equiv.)
35 - 105 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f4.5
Metering
Multi, Average, Spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
1/4 sec
30 sec
Max. shutter speed
1/1000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Optical (pentaprism)
White balance presets
6
8
Screen size
1.8"
2.7"
Screen resolution
200,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
SmartMedia
SDHC, Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion (NP-100)
Lithium Ion (D-LI50)
Weight
700 g
800 g
Dimensions
100 x 145 x 107 mm
141.5 x 101 x 70 mm
Year
1999
2008
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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 |
Fujifilm DS-260HD diagonal
The diagonal of DS-260HD 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 |
Pentax K20D diagonal
w = 23.40 mm
h = 15.60 mm
h = 15.60 mm
| Diagonal = √ | 23.40² + 15.60² | = 28.12 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
DS-260HD 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
K20D sensor area
Width = 23.40 mm
Height = 15.60 mm
Surface area = 23.40 × 15.60 = 365.04 mm²
Height = 15.60 mm
Surface area = 23.40 × 15.60 = 365.04 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 |
DS-260HD pixel pitch
Sensor width = 6.40 mm
Sensor resolution width = 1315 pixels
Sensor resolution width = 1315 pixels
| Pixel pitch = | 6.40 | × 1000 | = 4.87 µm |
| 1315 |
K20D pixel pitch
Sensor width = 23.40 mm
Sensor resolution width = 4680 pixels
Sensor resolution width = 4680 pixels
| Pixel pitch = | 23.40 | × 1000 | = 5 µm |
| 4680 |
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 |
DS-260HD pixel area
Pixel pitch = 4.87 µm
Pixel area = 4.87² = 23.72 µm²
Pixel area = 4.87² = 23.72 µm²
K20D pixel area
Pixel pitch = 5 µm
Pixel area = 5² = 25 µm²
Pixel area = 5² = 25 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 |
DS-260HD pixel density
Sensor resolution width = 1315 pixels
Sensor width = 0.64 cm
Pixel density = (1315 / 0.64)² / 1000000 = 4.22 MP/cm²
Sensor width = 0.64 cm
Pixel density = (1315 / 0.64)² / 1000000 = 4.22 MP/cm²
K20D pixel density
Sensor resolution width = 4680 pixels
Sensor width = 2.34 cm
Pixel density = (4680 / 2.34)² / 1000000 = 4 MP/cm²
Sensor width = 2.34 cm
Pixel density = (4680 / 2.34)² / 1000000 = 4 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
DS-260HD sensor resolution
Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 1.30
Resolution horizontal: X × r = 989 × 1.33 = 1315
Resolution vertical: X = 989
Sensor resolution = 1315 x 989
Sensor height = 4.80 mm
Effective megapixels = 1.30
| r = 6.40/4.80 = 1.33 |
|
Resolution vertical: X = 989
Sensor resolution = 1315 x 989
K20D sensor resolution
Sensor width = 23.40 mm
Sensor height = 15.60 mm
Effective megapixels = 14.60
Resolution horizontal: X × r = 3120 × 1.5 = 4680
Resolution vertical: X = 3120
Sensor resolution = 4680 x 3120
Sensor height = 15.60 mm
Effective megapixels = 14.60
| r = 23.40/15.60 = 1.5 |
|
Resolution vertical: X = 3120
Sensor resolution = 4680 x 3120
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 |
DS-260HD crop factor
Sensor diagonal in mm = 8.00 mm
| Crop factor = | 43.27 | = 5.41 |
| 8.00 |
K20D crop factor
Sensor diagonal in mm = 28.12 mm
| Crop factor = | 43.27 | = 1.54 |
| 28.12 |
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).
DS-260HD equivalent aperture
Crop factor = 5.41
Aperture = f2.8 - f4.5
35-mm equivalent aperture = (f2.8 - f4.5) × 5.41 = f15.1 - f24.3
Aperture = f2.8 - f4.5
35-mm equivalent aperture = (f2.8 - f4.5) × 5.41 = f15.1 - f24.3
K20D 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
Pentax K20D, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax K20D is 1.54
Crop factor for Pentax K20D is 1.54
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