Konica-Minolta Dynax 7D vs. Sony Alpha DSLR-A100

Comparison

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Dynax 7D image
vs
Alpha DSLR-A100 image
Konica-Minolta Dynax 7D Sony Alpha DSLR-A100
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Megapixels
6.31
10.00
Max. image resolution
3008 x 2000
3872 x 2592

Sensor

Sensor type
CCD
CCD
Sensor size
23.5 x 15.7 mm
23.6 x 15.8 mm
Sensor resolution
3077 x 2051
3861 x 2591
Diagonal
28.26 mm
28.40 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 »

Actual sensor size

Note: Actual size is set to screen → change »
vs
1 : 1.01
(ratio)
Konica-Minolta Dynax 7D Sony Alpha DSLR-A100
Surface area:
368.95 mm² vs 372.88 mm²
Difference: 3.93 mm² (1%)
Alpha DSLR-A100 sensor is slightly bigger than Dynax 7D sensor (only 1% difference).
Note: You are comparing cameras of different generations. There is a 2 year gap between Konica-Minolta Dynax 7D (2004) and Sony Alpha DSLR-A100 (2006). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
7.64 µm
6.11 µm
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.
Difference: 1.53 µm (25%)
Pixel pitch of Dynax 7D is approx. 25% higher than pixel pitch of Alpha DSLR-A100.
Pixel area
58.37 µm²
37.33 µm²
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.
Relative pixel sizes:
vs
Pixel area difference: 21.04 µm² (56%)
A pixel on Konica-Minolta Dynax 7D sensor is approx. 56% bigger than a pixel on Sony Alpha DSLR-A100.
Pixel density
1.71 MP/cm²
2.68 MP/cm²
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.
Difference: 0.97 µm (57%)
Sony Alpha DSLR-A100 has approx. 57% higher pixel density than Konica-Minolta Dynax 7D.
To learn about the accuracy of these numbers, click here.



Specs

Konica-Minolta Dynax 7D
Sony Alpha DSLR-A100
Crop factor
1.53
1.52
Total megapixels
10.80
Effective megapixels
10.00
Optical zoom
Digital zoom
No
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200
Auto, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Centre weighted, Multi-segment, Spot
Multi, Center-weighted, Spot
Exposure compensation
±3 EV (in 1/3 EV, 1/2 EV steps)
±2 EV (in 1/3 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
Optical (pentamirror)
White balance presets
7
7
Screen size
2.5"
2.5"
Screen resolution
207,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
CompactFlash type I, CompactFlash type II
Compact Flash (Type I or II)
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-Ion
Lithium-Ion (NP-FM55H)
Weight
760 g
638 g
Dimensions
150 x 106 x 78 mm
133 x 95 x 71 mm
Year
2004
2006




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Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Konica-Minolta Dynax 7D diagonal

w = 23.50 mm
h = 15.70 mm
Diagonal =  23.50² + 15.70²   = 28.26 mm

Sony Alpha DSLR-A100 diagonal

w = 23.60 mm
h = 15.80 mm
Diagonal =  23.60² + 15.80²   = 28.40 mm


Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

Dynax 7D sensor area

Width = 23.50 mm
Height = 15.70 mm

Surface area = 23.50 × 15.70 = 368.95 mm²

Alpha DSLR-A100 sensor area

Width = 23.60 mm
Height = 15.80 mm

Surface area = 23.60 × 15.80 = 372.88 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

Dynax 7D pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 3077 pixels
Pixel pitch =   23.50  × 1000  = 7.64 µm
3077

Alpha DSLR-A100 pixel pitch

Sensor width = 23.60 mm
Sensor resolution width = 3861 pixels
Pixel pitch =   23.60  × 1000  = 6.11 µm
3861


Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:
Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:
Pixel area =   sensor surface area in mm²
effective megapixels

Dynax 7D pixel area

Pixel pitch = 7.64 µm

Pixel area = 7.64² = 58.37 µm²

Alpha DSLR-A100 pixel area

Pixel pitch = 6.11 µm

Pixel area = 6.11² = 37.33 µm²


Pixel density

Pixel density can be calculated with the following 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

Dynax 7D pixel density

Sensor resolution width = 3077 pixels
Sensor width = 2.35 cm

Pixel density = (3077 / 2.35)² / 1000000 = 1.71 MP/cm²

Alpha DSLR-A100 pixel density

Sensor resolution width = 3861 pixels
Sensor width = 2.36 cm

Pixel density = (3861 / 2.36)² / 1000000 = 2.68 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:
(X × r) × X = effective megapixels × 1000000    →   
X =  effective megapixels × 1000000
r
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

Dynax 7D sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.70 mm
Effective megapixels = 6.31
r = 23.50/15.70 = 1.5
X =  6.31 × 1000000  = 2051
1.5
Resolution horizontal: X × r = 2051 × 1.5 = 3077
Resolution vertical: X = 2051

Sensor resolution = 3077 x 2051

Alpha DSLR-A100 sensor resolution

Sensor width = 23.60 mm
Sensor height = 15.80 mm
Effective megapixels = 10.00
r = 23.60/15.80 = 1.49
X =  10.00 × 1000000  = 2591
1.49
Resolution horizontal: X × r = 2591 × 1.49 = 3861
Resolution vertical: X = 2591

Sensor resolution = 3861 x 2591


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


Dynax 7D crop factor

Sensor diagonal in mm = 28.26 mm
Crop factor =   43.27  = 1.53
28.26

Alpha DSLR-A100 crop factor

Sensor diagonal in mm = 28.40 mm
Crop factor =   43.27  = 1.52
28.40

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).

Dynax 7D 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 Konica-Minolta Dynax 7D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Konica-Minolta Dynax 7D is 1.53

Alpha DSLR-A100 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 DSLR-A100, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony Alpha DSLR-A100 is 1.52

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