Pentax K10D vs. Sony Alpha a6400
Comparison
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Megapixels
10.00
24.20
Max. image resolution
3872 x 2592
6000 x 4000
Sensor
Sensor type
CCD
CMOS
Sensor size
23.5 x 15.7 mm
23.5 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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| Pentax K10D | Sony Alpha a6400 | |
Surface area:
| 368.95 mm² | vs | 366.60 mm² |
Difference: 2.35 mm² (0.6%)
K10D sensor is slightly bigger than Alpha a6400 sensor (only 0.6% difference).
Note: You are comparing sensors of vastly different generations.
There is a gap of 13 years between Pentax K10D (2006) and
Sony Alpha a6400 (2019).
Thirteen years is a huge amount of time,
technology wise, resulting in newer sensor being much more
efficient than the older one.
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: 21.71 µm² (143%)
A pixel on Pentax K10D sensor is approx. 143% bigger than a pixel on Sony Alpha a6400.
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
Pentax K10D
Sony Alpha a6400
Total megapixels
10.80
25.00
Effective megapixels
10.00
24.20
Optical zoom
Digital zoom
No
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100-32000 (expandable to 102400)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Metering
Centre weighted, Multi-segment, Spot
Multi, Center-weighted, Highlight-weighted, Spot
Exposure compensation
±3 EV (in 1/3 EV, 1/2 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
Bulb+30 sec
30 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentaprism)
Electronic
White balance presets
7
10
Screen size
2.5"
3"
Screen resolution
210,000 dots
921,600 dots
Video capture
Max. video resolution
3840x2160 (30p/25p/24p)
Storage types
Secure Digital
SD/SDHC/SDXC/MS PRO Duo
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable
NP-FW50 lithium-ion battery
Weight
710 g
403 g
Dimensions
141.5 x 101 x 70 mm
120 x 66.9 x 59.7 mm
Year
2006
2019
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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 |
Pentax K10D diagonal
w = 23.50 mm
h = 15.70 mm
h = 15.70 mm
| Diagonal = √ | 23.50² + 15.70² | = 28.26 mm |
Sony Alpha a6400 diagonal
w = 23.50 mm
h = 15.60 mm
h = 15.60 mm
| Diagonal = √ | 23.50² + 15.60² | = 28.21 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
K10D 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
Alpha a6400 sensor area
Width = 23.50 mm
Height = 15.60 mm
Surface area = 23.50 × 15.60 = 366.60 mm²
Height = 15.60 mm
Surface area = 23.50 × 15.60 = 366.60 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 |
K10D pixel pitch
Sensor width = 23.50 mm
Sensor resolution width = 3873 pixels
Sensor resolution width = 3873 pixels
| Pixel pitch = | 23.50 | × 1000 | = 6.07 µm |
| 3873 |
Alpha a6400 pixel pitch
Sensor width = 23.50 mm
Sensor resolution width = 6045 pixels
Sensor resolution width = 6045 pixels
| Pixel pitch = | 23.50 | × 1000 | = 3.89 µm |
| 6045 |
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 |
K10D pixel area
Pixel pitch = 6.07 µm
Pixel area = 6.07² = 36.84 µm²
Pixel area = 6.07² = 36.84 µm²
Alpha a6400 pixel area
Pixel pitch = 3.89 µm
Pixel area = 3.89² = 15.13 µm²
Pixel area = 3.89² = 15.13 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 |
K10D pixel density
Sensor resolution width = 3873 pixels
Sensor width = 2.35 cm
Pixel density = (3873 / 2.35)² / 1000000 = 2.72 MP/cm²
Sensor width = 2.35 cm
Pixel density = (3873 / 2.35)² / 1000000 = 2.72 MP/cm²
Alpha a6400 pixel density
Sensor resolution width = 6045 pixels
Sensor width = 2.35 cm
Pixel density = (6045 / 2.35)² / 1000000 = 6.62 MP/cm²
Sensor width = 2.35 cm
Pixel density = (6045 / 2.35)² / 1000000 = 6.62 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
K10D sensor resolution
Sensor width = 23.50 mm
Sensor height = 15.70 mm
Effective megapixels = 10.00
Resolution horizontal: X × r = 2582 × 1.5 = 3873
Resolution vertical: X = 2582
Sensor resolution = 3873 x 2582
Sensor height = 15.70 mm
Effective megapixels = 10.00
| r = 23.50/15.70 = 1.5 |
|
Resolution vertical: X = 2582
Sensor resolution = 3873 x 2582
Alpha a6400 sensor resolution
Sensor width = 23.50 mm
Sensor height = 15.60 mm
Effective megapixels = 24.20
Resolution horizontal: X × r = 4003 × 1.51 = 6045
Resolution vertical: X = 4003
Sensor resolution = 6045 x 4003
Sensor height = 15.60 mm
Effective megapixels = 24.20
| r = 23.50/15.60 = 1.51 |
|
Resolution vertical: X = 4003
Sensor resolution = 6045 x 4003
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 |
K10D crop factor
Sensor diagonal in mm = 28.26 mm
| Crop factor = | 43.27 | = 1.53 |
| 28.26 |
Alpha a6400 crop factor
Sensor diagonal in mm = 28.21 mm
| Crop factor = | 43.27 | = 1.53 |
| 28.21 |
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).
K10D 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 K10D, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax K10D is 1.53
Crop factor for Pentax K10D is 1.53
Alpha a6400 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 a6400, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Sony Alpha a6400 is 1.53
Crop factor for Sony Alpha a6400 is 1.53
More comparisons of Pentax K10D:
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- Pentax K10D vs. Pentax K-500
- Pentax K10D vs. Pentax K100D
- Pentax K10D vs. Canon EOS 30D
- Pentax K10D vs. Canon EOS 7D
- Pentax K10D vs. Sony Cyber-shot DSC-RX100
- Pentax K10D vs. Sony Cyber-shot DSC-R1
- Pentax K10D vs. Sigma SD14
- Pentax K10D vs. Olympus E-1
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