Pentax MX-1 vs. Fujifilm X20
Comparison
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| Pentax MX-1 | Fujifilm X20 | ||||
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Megapixels
12.00
12.00
Max. image resolution
4000 x 3000
4000 x 3000
Sensor
Sensor type
CMOS
CMOS
Sensor size
1/1.7" (~ 7.53 x 5.64 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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| 1 | : | 1.37 |
| (ratio) | ||
| Pentax MX-1 | Fujifilm X20 | |
Surface area:
| 42.47 mm² | vs | 58.08 mm² |
Difference: 15.61 mm² (37%)
X20 sensor is approx. 1.37x bigger than MX-1 sensor.
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: 1.31 µm² (37%)
A pixel on Fujifilm X20 sensor is approx. 37% bigger than a pixel on Pentax MX-1.
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 MX-1
Fujifilm X20
Total megapixels
12.76
Effective megapixels
12.00
12.00
Optical zoom
4x
4x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800
Auto, 100, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000, 6400, 12800
RAW
Manual focus
Normal focus range
60 cm
50 cm
Macro focus range
1 cm
1 cm
Focal length (35mm equiv.)
28 - 112 mm
28 - 112 mm
Aperture priority
Yes
Yes
Max. aperture
f1.8 - f2.5
f2.0 - f2.8
Metering
Multi, Center-weighted, Spot
Multi, Average, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 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
None
Optical (tunnel)
White balance presets
9
7
Screen size
3"
2.8"
Screen resolution
920,000 dots
460,000 dots
Video capture
Max. video resolution
1920x1080 (60p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion D-Li-106 rechargeable battery
Lithium-Ion NP-50 rechargeable battery
Weight
391 g
353 g
Dimensions
122 x 61 x 51 mm
117 x 69.6 x 56.8 mm
Year
2013
2013
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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 MX-1 diagonal
The diagonal of MX-1 sensor is not 1/1.7 or 0.59" (14.9 mm) as you might expect, but approximately two thirds of
that value - 9.41 mm. If you want to know why, see
sensor sizes.
w = 7.53 mm
h = 5.64 mm
w = 7.53 mm
h = 5.64 mm
| Diagonal = √ | 7.53² + 5.64² | = 9.41 mm |
Fujifilm X20 diagonal
The diagonal of X20 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.
MX-1 sensor area
Width = 7.53 mm
Height = 5.64 mm
Surface area = 7.53 × 5.64 = 42.47 mm²
Height = 5.64 mm
Surface area = 7.53 × 5.64 = 42.47 mm²
X20 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 |
MX-1 pixel pitch
Sensor width = 7.53 mm
Sensor resolution width = 4011 pixels
Sensor resolution width = 4011 pixels
| Pixel pitch = | 7.53 | × 1000 | = 1.88 µm |
| 4011 |
X20 pixel pitch
Sensor width = 8.80 mm
Sensor resolution width = 3995 pixels
Sensor resolution width = 3995 pixels
| Pixel pitch = | 8.80 | × 1000 | = 2.2 µm |
| 3995 |
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 |
MX-1 pixel area
Pixel pitch = 1.88 µm
Pixel area = 1.88² = 3.53 µm²
Pixel area = 1.88² = 3.53 µm²
X20 pixel area
Pixel pitch = 2.2 µm
Pixel area = 2.2² = 4.84 µm²
Pixel area = 2.2² = 4.84 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 |
MX-1 pixel density
Sensor resolution width = 4011 pixels
Sensor width = 0.753 cm
Pixel density = (4011 / 0.753)² / 1000000 = 28.37 MP/cm²
Sensor width = 0.753 cm
Pixel density = (4011 / 0.753)² / 1000000 = 28.37 MP/cm²
X20 pixel density
Sensor resolution width = 3995 pixels
Sensor width = 0.88 cm
Pixel density = (3995 / 0.88)² / 1000000 = 20.61 MP/cm²
Sensor width = 0.88 cm
Pixel density = (3995 / 0.88)² / 1000000 = 20.61 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
MX-1 sensor resolution
Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 12.00
Resolution horizontal: X × r = 2993 × 1.34 = 4011
Resolution vertical: X = 2993
Sensor resolution = 4011 x 2993
Sensor height = 5.64 mm
Effective megapixels = 12.00
| r = 7.53/5.64 = 1.34 |
|
Resolution vertical: X = 2993
Sensor resolution = 4011 x 2993
X20 sensor resolution
Sensor width = 8.80 mm
Sensor height = 6.60 mm
Effective megapixels = 12.00
Resolution horizontal: X × r = 3004 × 1.33 = 3995
Resolution vertical: X = 3004
Sensor resolution = 3995 x 3004
Sensor height = 6.60 mm
Effective megapixels = 12.00
| r = 8.80/6.60 = 1.33 |
|
Resolution vertical: X = 3004
Sensor resolution = 3995 x 3004
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 |
MX-1 crop factor
Sensor diagonal in mm = 9.41 mm
| Crop factor = | 43.27 | = 4.6 |
| 9.41 |
X20 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).
MX-1 equivalent aperture
Crop factor = 4.6
Aperture = f1.8 - f2.5
35-mm equivalent aperture = (f1.8 - f2.5) × 4.6 = f8.3 - f11.5
Aperture = f1.8 - f2.5
35-mm equivalent aperture = (f1.8 - f2.5) × 4.6 = f8.3 - f11.5
X20 equivalent aperture
Crop factor = 3.93
Aperture = f2.0 - f2.8
35-mm equivalent aperture = (f2.0 - f2.8) × 3.93 = f7.9 - f11
Aperture = f2.0 - f2.8
35-mm equivalent aperture = (f2.0 - f2.8) × 3.93 = f7.9 - f11
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