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Tuesday, October 27, 2009

Cypress Full Frame CMOS Sensor is to be Used in the Rumoured Upcoming Pentax Full Frame Body?

With surprise and to doubt about the reason(s) behind, Cypress has updated their datasheet of their 36 x 24mm CMOS sensor at their website, recently:-

http://download.cypress.com.edgesuite.net/design_resources/datasheets/contents/ibis4_14000_8.pdf

And, a rumour has begun recently for that the "upcoming" Pentax Full Frame DSLR body will use this sensor:-

http://www.nphoto.net/news/2009-10/22/6f1e08121de985fa.shtml
(Text in Simplified Chinese)

..of which the contents are 90% the same as another Chinese article that was posted two years ago at another Chinese site:-

http://news.fengniao.com/69/691199.html
(Text in Simplified Chinese)

But just don't look down at those Chinese websites' reports. My experiences were that they were either pure rumours and imaginations or the cases were just in another extreme - the authors received REAL information from insiders and they dared much to disclose, without anything of being afraid! :-)

As for the Cypress sensor, below are some of my impressions on the published Specs:-

1. 8um Pixel Size is really large. The K-x pixel size is only 5.6um, as I have calculated last time;

2. The "Rolling Shutter" capability means that it should be video recording ready, and also the Live View (For more technical information about the "rolling shutter", read my last post here);

3. The Master Clock is of 15MHz is slow (The old K10D Sony CCD is clocked at 25MHz);

4. As such, the Maximum Frame Rate of the sensor is low, too, at only 3 fps;

5. The Full Well Capacity at 65,000 electrons is large;

6. The Dark Current at a rate of 223 electrons per second is very low (which affect noise performance and dynamic range);

7. The Dynamic Range of 65.4 dB means a theoretical maximum DR of 10.86EV steps which is not too impressive, in contrast;

8. At a 3.3V operating voltage and a low operating frequency of 15MHz, this would be a low power consumption device (< 176mW as specified). But actually one thing I don't understand is about the DR spec in dB. If I have to calculate it from the Full Well Capacity to the Dark Current, it is only of 49.29 dB, which is yet lower than the published spec and the value is lower than typical, also. (If any of the imager experts read here, please enlighten me! TIA. :-))

Well, after all, actually there is no outsider knows at the current stage if Pentax is really making a Full Frame DSLR body, not even mention to which and what sensor in such a rumoured body. Btw, I think there are still other (limited) choices, but this Cypress CMOS would be a relatively much cheaper option, I bet. Performance wise, it is yet unknown. But normally I would not expect miracles from novices - even the electronics giant Samsung has been striking much for making a better APS-C sensor, with higher performance, better image quality and less bugs, frankly.

Comments (5)

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Another one rumour again!!!
Another Rice High´s rumour again!!!
Cypress is not a novice in sensor manufacturing.. they have been manufacturing image sensors since 2005. However their sensors are targeted (which is also stated in the product description) mostly to industrial / machine vision applications. All of these sensors have some primary special application, which is by all means not a DSLR camera.

Furthermore, this sensor does not have "rolling shutter capability", this sensor has a rolling shutter *ONLY*.

IMHO a DSLR camera should probably have a global shutter sensor (so that all pixels are exposed for the time dictated by the mechanical shutter, otherwise the sensor's rolling shutter and the mechanical shutter movement would interfere, i guess?), with rolling shutter capability for live view and video.

This does not seem to apply to this particular sensor.
RiceHigh, this sensor *is not* video ready. Yes, it can reach over 25fps (needed for video) but at a very low resolution. At most, one could get a bad quality Live View mode out of this (remember K20D?)
It's not entirely impossible... But unless it will drastically undercut other maker's prices, I doubt a 3fps, no video, low resolution, unknown high ISO performance (without this it will be "epic fail") sensor would be the best choice. But then, a better performing sensor won't be a better option?
To sum it up, IMO this rumor is made up.
Cypress are novices, they basically took over Kodak's CMOS sensor for DSLR-knowledge. They manufactured the Kodak 24x36 CMOS sensor used in the Kodak DCS 14/c and 14/n. They are a small player with limited resources yes, but no novices. However it is doubtful if they have the resources to make a competetive DSLR sensor at this stage.
I meant, Cypress are no novices. :)

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