Pentax K-3 Mark III vs. Sony a6600
Comparison
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| Pentax K-3 Mark III | Sony a6600 | ||||
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Megapixels
25.73
24.20
Max. image resolution
6192 x 4128
6000 x 4000
Sensor
Sensor type
CMOS
CMOS
Sensor size
23.3 x 15.5 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 K-3 Mark III | Sony a6600 | |
Surface area:
| 361.15 mm² | vs | 366.60 mm² |
Difference: 5.45 mm² (2%)
a6600 sensor is slightly bigger than K-3 Mark III sensor (only 2% difference).
Note: You are comparing cameras of different generations.
There is a 2 year gap between Pentax K-3 Mark III (2021) and Sony a6600 (2019).
All things being equal, newer sensor generations generally outperform the older.
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: 1.07 µm² (8%)
A pixel on Sony a6600 sensor is approx. 8% bigger than a pixel on Pentax K-3 Mark III.
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 K-3 Mark III
Sony a6600
Total megapixels
26.78
25.00
Effective megapixels
25.73
24.20
Optical zoom
Digital zoom
Yes
Yes
ISO sensitivity
Auto (100-1600000)
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
Multi, Center-weighted, Highlight-weighted, Spot
Multi, Center-weighted, Highlight-weighted, Spot
Exposure compensation
±5 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
30 sec
30 sec
Max. shutter speed
1/8000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentaprism)
Electronic
White balance presets
8
8
Screen size
3.2"
3"
Screen resolution
1,620,000 dots
921,600 dots
Video capture
Max. video resolution
3840x2160 (30p/24p)
3840x2160 (30p/25p/24p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC, MS Pro Duo
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
D-LI90 Lithium-ion battery
NP-FZ1000 ilthium-ion battery
Weight
820 g
503 g
Dimensions
134.5 x 103.5 x 73.5 mm
120 x 66.9 x 69.3 mm
Year
2021
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 K-3 Mark III diagonal
w = 23.30 mm
h = 15.50 mm
h = 15.50 mm
| Diagonal = √ | 23.30² + 15.50² | = 27.98 mm |
Sony a6600 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.
K-3 Mark III sensor area
Width = 23.30 mm
Height = 15.50 mm
Surface area = 23.30 × 15.50 = 361.15 mm²
Height = 15.50 mm
Surface area = 23.30 × 15.50 = 361.15 mm²
a6600 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 |
K-3 Mark III pixel pitch
Sensor width = 23.30 mm
Sensor resolution width = 6213 pixels
Sensor resolution width = 6213 pixels
| Pixel pitch = | 23.30 | × 1000 | = 3.75 µm |
| 6213 |
a6600 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 |
K-3 Mark III pixel area
Pixel pitch = 3.75 µm
Pixel area = 3.75² = 14.06 µm²
Pixel area = 3.75² = 14.06 µm²
a6600 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 |
K-3 Mark III pixel density
Sensor resolution width = 6213 pixels
Sensor width = 2.33 cm
Pixel density = (6213 / 2.33)² / 1000000 = 7.11 MP/cm²
Sensor width = 2.33 cm
Pixel density = (6213 / 2.33)² / 1000000 = 7.11 MP/cm²
a6600 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
K-3 Mark III sensor resolution
Sensor width = 23.30 mm
Sensor height = 15.50 mm
Effective megapixels = 25.73
Resolution horizontal: X × r = 4142 × 1.5 = 6213
Resolution vertical: X = 4142
Sensor resolution = 6213 x 4142
Sensor height = 15.50 mm
Effective megapixels = 25.73
| r = 23.30/15.50 = 1.5 |
|
Resolution vertical: X = 4142
Sensor resolution = 6213 x 4142
a6600 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 |
K-3 Mark III crop factor
Sensor diagonal in mm = 27.98 mm
| Crop factor = | 43.27 | = 1.55 |
| 27.98 |
a6600 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).
K-3 Mark III 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 K-3 Mark III, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax K-3 Mark III is 1.55
Crop factor for Pentax K-3 Mark III is 1.55
a6600 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 a6600, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Sony a6600 is 1.53
Crop factor for Sony a6600 is 1.53
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- Pentax K-3 Mark III vs. Sigma fp L
- Pentax K-3 Mark III vs. Pentax 645Z
- Pentax K-3 Mark III vs. Sony a7C
- Pentax K-3 Mark III vs. Canon EOS RP
- Pentax K-3 Mark III vs. Nikon D780
- Pentax K-3 Mark III vs. Pentax K10D
- Pentax K-3 Mark III vs. Sony a7S III
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