Minox DM 1 vs. Pentax 645Z
Comparison
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| Minox DM 1 | Pentax 645Z | ||||
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Megapixels
3.20
51.40
Max. image resolution
2816 x 2112
8256 x 6192
Sensor
Sensor type
CMOS
CMOS
Sensor size
1/2" (~ 6.4 x 4.8 mm)
44 x 33 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 | : | 47.27 |
| (ratio) | ||
| Minox DM 1 | Pentax 645Z | |
Surface area:
| 30.72 mm² | vs | 1452.00 mm² |
Difference: 1421.28 mm² (4627%)
645Z sensor is approx. 47.27x bigger than DM 1 sensor.
Note: You are comparing sensors of very different generations.
There is a gap of 9 years between Minox DM 1 (2005) and Pentax 645Z (2014).
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: 18.69 µm² (194%)
A pixel on Pentax 645Z sensor is approx. 194% bigger than a pixel on Minox DM 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
Minox DM 1
Pentax 645Z
Total megapixels
52.99
Effective megapixels
51.40
Optical zoom
No
Digital zoom
Yes
ISO sensitivity
Auto, 100, 200, 400
Auto, 100-204800
RAW
Manual focus
Normal focus range
80 cm
Macro focus range
Focal length (35mm equiv.)
44 mm
Aperture priority
No
Yes
Max. aperture
f3.5
Metering
Centre weighted
Multi, Center-weighted, Spot
Exposure compensation
±1.8 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/8 sec
30 sec
Max. shutter speed
1/2000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
None
Optical (pentaprism)
White balance presets
5
10
Screen size
2"
3.2"
Screen resolution
1,037,000 dots
Video capture
Max. video resolution
1920x1080 (60i/50i/30p/25p/24p)
Storage types
MultiMedia, Secure Digital
SD/SDHC/SDXC
USB
USB 1.1
USB 3.0 (5 GBit/sec)
HDMI
Wireless
GPS
Battery
Li-Ion
Rechargeable Lithium-ion Battery D-LI90
Weight
94 g
1550 g
Dimensions
105 x 64 x 17 mm
156 x 117 x 123 mm
Year
2005
2014
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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 |
Minox DM 1 diagonal
The diagonal of DM 1 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 645Z diagonal
w = 44.00 mm
h = 33.00 mm
h = 33.00 mm
| Diagonal = √ | 44.00² + 33.00² | = 55.00 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
DM 1 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
645Z sensor area
Width = 44.00 mm
Height = 33.00 mm
Surface area = 44.00 × 33.00 = 1452.00 mm²
Height = 33.00 mm
Surface area = 44.00 × 33.00 = 1452.00 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 |
DM 1 pixel pitch
Sensor width = 6.40 mm
Sensor resolution width = 2063 pixels
Sensor resolution width = 2063 pixels
| Pixel pitch = | 6.40 | × 1000 | = 3.1 µm |
| 2063 |
645Z pixel pitch
Sensor width = 44.00 mm
Sensor resolution width = 8269 pixels
Sensor resolution width = 8269 pixels
| Pixel pitch = | 44.00 | × 1000 | = 5.32 µm |
| 8269 |
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 |
DM 1 pixel area
Pixel pitch = 3.1 µm
Pixel area = 3.1² = 9.61 µm²
Pixel area = 3.1² = 9.61 µm²
645Z pixel area
Pixel pitch = 5.32 µm
Pixel area = 5.32² = 28.3 µm²
Pixel area = 5.32² = 28.3 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 |
DM 1 pixel density
Sensor resolution width = 2063 pixels
Sensor width = 0.64 cm
Pixel density = (2063 / 0.64)² / 1000000 = 10.39 MP/cm²
Sensor width = 0.64 cm
Pixel density = (2063 / 0.64)² / 1000000 = 10.39 MP/cm²
645Z pixel density
Sensor resolution width = 8269 pixels
Sensor width = 4.4 cm
Pixel density = (8269 / 4.4)² / 1000000 = 3.53 MP/cm²
Sensor width = 4.4 cm
Pixel density = (8269 / 4.4)² / 1000000 = 3.53 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
DM 1 sensor resolution
Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 3.20
Resolution horizontal: X × r = 1551 × 1.33 = 2063
Resolution vertical: X = 1551
Sensor resolution = 2063 x 1551
Sensor height = 4.80 mm
Effective megapixels = 3.20
| r = 6.40/4.80 = 1.33 |
|
Resolution vertical: X = 1551
Sensor resolution = 2063 x 1551
645Z sensor resolution
Sensor width = 44.00 mm
Sensor height = 33.00 mm
Effective megapixels = 51.40
Resolution horizontal: X × r = 6217 × 1.33 = 8269
Resolution vertical: X = 6217
Sensor resolution = 8269 x 6217
Sensor height = 33.00 mm
Effective megapixels = 51.40
| r = 44.00/33.00 = 1.33 |
|
Resolution vertical: X = 6217
Sensor resolution = 8269 x 6217
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 |
DM 1 crop factor
Sensor diagonal in mm = 8.00 mm
| Crop factor = | 43.27 | = 5.41 |
| 8.00 |
645Z crop factor
Sensor diagonal in mm = 55.00 mm
| Crop factor = | 43.27 | = 0.79 |
| 55.00 |
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).
DM 1 equivalent aperture
Crop factor = 5.41
Aperture = f3.5
35-mm equivalent aperture = (f3.5) × 5.41 = f18.9
Aperture = f3.5
35-mm equivalent aperture = (f3.5) × 5.41 = f18.9
645Z 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 645Z, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax 645Z is 0.79
Crop factor for Pentax 645Z is 0.79
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.