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02-16-2015, 11:29 AM   #1
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Pixel size of K-S2 CMOS

According to Kenspo, the CMOS chip in the K-S2 is different from the one in the K-S1. I want to know did the pixel size remain the same as the K-S1 or did they increase the pixel size to the size that is used in the K-3 CMOS chip?

02-16-2015, 12:59 PM - 1 Like   #2
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The KS2 is 5472x3648 at 23.5x15.6mm and the KS1 is listed as the same. So the pixel pitch is the same unless some advance in the gap between the pixels makes it slightly different. If the sensor is not identical then its likely from the same supplier Sony and only product improved in a small sense. There would likely be no appreciable difference in performance. Note that that particular sensor doesn't have many cameras using it (how many 20MP camera models from different vendors are there?). That last point is interesting as low volume is higher in cost. Sony had a good run with the 16MP sensors with many makes and models using it. The same seems to be true with the 24 MP sensor. Not so with the 20MP.
02-18-2015, 08:52 AM   #3
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Maybe it is a slightly improved "revision" of the same sensor by the same manufacturer. I hope it has the same performances we get on the K-S1, which seems pretty solid...
02-22-2015, 04:27 PM   #4
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QuoteOriginally posted by Vantage-Point Quote
did they increase the pixel size to the size that is used in the K-3 CMOS chip
It would go the other way if you are talking about pixel size. K-3 has smaller pixel size. The K-S1 pixel pitch is 4.3 microns, the K-3 is 3.9.

QuoteOriginally posted by Fauxton Quote
Note that that particular sensor doesn't have many cameras using it (how many 20MP camera models from different vendors are there?). That last point is interesting as low volume is higher in cost. Sony had a good run with the 16MP sensors with many makes and models using it. The same seems to be true with the 24 MP sensor. Not so with the 20MP.
A few popular cameras used the Sony 20MP chip - including Sony NEX's like the A3000, A3500, and the A5000, and the Alpha 58 DSLR. The NEX's in particular would have done very respectable sales volume. By the time Pentax chose to use that chip, Sony would probably have been able to offer it to them for next to nothing.

02-28-2015, 06:58 PM   #5
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QuoteOriginally posted by rawr Quote
It would go the other way if you are talking about pixel size. K-3 has smaller pixel size. The K-S1 pixel pitch is 4.3 microns, the K-3 is 3.9.



A few popular cameras used the Sony 20MP chip - including Sony NEX's like the A3000, A3500, and the A5000, and the Alpha 58 DSLR. The NEX's in particular would have done very respectable sales volume. By the time Pentax chose to use that chip, Sony would probably have been able to offer it to them for next to nothing.
The Nexes you mention and the A58 still wouldn't have the same uptake (sales volume) of the 16 and 24's which are offered across more multiple vendors cameras.
03-02-2015, 10:17 AM   #6
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QuoteOriginally posted by Fauxton Quote
The KS2 is 5472x3648 at 23.5x15.6mm and the KS1 is listed as the same. So the pixel pitch is the same unless some advance in the gap between the pixels makes it slightly different. If the sensor is not identical then its likely from the same supplier Sony and only product improved in a small sense. There would likely be no appreciable difference in performance. Note that that particular sensor doesn't have many cameras using it (how many 20MP camera models from different vendors are there?). That last point is interesting as low volume is higher in cost. Sony had a good run with the 16MP sensors with many makes and models using it. The same seems to be true with the 24 MP sensor. Not so with the 20MP.
Samsung managed to have pixels the size of their NX30 (20 MP) in their NX1 (28 MP) thanks to a BSI sensor that is also produced in a smaller process (65nm IIRC), and the sensor in the NX30 wasn't bad. However they marketed the hell out of that new sensor. That Pentax doesn't do anything like that suggests that the sensor is very similar to what the KS-1 had.
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