Friday, March 12, 2010

Comparison of Sensor Specs - 645D Against Others


(Image Source Page: http://www.pentax.jp/japan/products/645d/feature.html)

Since the 645D was announced, people, in particular Pentaxians, have been arguing about the advantages against the shortcomings of the new 645D when it is compared against other DSLRs of different sensor sizes, pixel counts and form factors. I think it would be of no harm for me to list out the factual data of some of the sensors used by some of the current popular DSLRs that could be compared, for an overview on the basic physical and specification differences, before heat debates and more discussions are to be carried on..

Camera / Digital Back
Sensor Size (in mm)
Sensor Area (in mm^2)
Resolution
Aspect Ratio
Total Mega Pixels
Pixel Size (in um)
ISO Range
Pentax 645D
44 x 33
1452
7264 x 5440
4 : 3
40.24
6.1 x 6.1
200 - 1000
(100 - 1600 Expanded)
Mamiya DM4044 x 331452
7350 x 55624 : 3
40.88
6.0 x 5.9
80 - 800
Mamiya DM56
56 x 36
2016
9288 x 60003.1 : 2
55.73
6.0 x 6.0
80 - 800
Mamiya DM3348 x 36
1728
6726 x 5040
4 : 3
33.90
7.1 x 7.1
50 - 800
Canon EOS 1D3 / 5D2
36 x 24
864
5616 x 3744
3 : 2
21.03
6.4 x 6.4
1D3: 100 - 1600
(50 - 3200 Expanded)
5D2: 100 - 6400
(50 - 25600 Expanded)
Nikon D3X
36 x 24
864
6048 x 4032
3 : 2
24.39
6.0 x 6.0
100 - 1600
Nikon D3S / D700
36 x 24
864
4256 x 2832
3 : 212.05
8.5 x 8.5
D3S: 200 - 12800
(100 - 102400 Expanded)
D700: 200 - 6400
(100 - 25600 Expanded)
Pentax K-x
24 x 16
384
4288 x 2848
3 : 212.21
5.6 x 5.6
200 - 6400
(100 - 12800 Expanded)

So, for anyone who is interested to compare, now you can compare all these parameters and calculate their ratios and differences in percentage and etc.

Do it endlessly till the end of the days, which is just another kind of measurbation! ;-D Enjoy!

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