CMOS for Pentax?

[Spyer2]

Do you think Pentax will replace the Sony CCD to CMOS in their future DSLR??

[fengwei]

Originally Posted by Spyer2 Do you think Pentax will replace the Sony CCD to CMOS in their future DSLR??

Not likely I guess. And don't need to lah. Each has its own pros and cons. But I do hope Pentax comes out with an 8m or 12m DSLR though.

But for now, I'm happy with my 6m D

[Spyer2]

Ya I also looking forward for another high end DSLR in future, But seems like CMOS is doing well than CCD leh..

[hammer_400]

Originally Posted by Spyer2 Ya I also looking forward for another high end DSLR in future, But seems like CMOS is doing well than CCD leh..

if u consider low high iso noise then cmos on canon, it is partly due to canon's noise reduction...

quote from imaging resource....

on 1d mkII

....canon's cmos uniquely allows significant image-processing functions to be integrated right onto the sensor chip, before the image data even reaches the digitizing electronics. In the 1D Mark II's sensor, Canon has implemented no fewer than three different anti-noise processing techniques directly on-chip. While remaining very close-mouthed about the specifics of these anti-noise techniques, Canon does note that they affect both fixed-pattern and random noise generated within the sensor elements.

A common but little-recognized source of image noise in digital cameras is electrical noise generated by the digital signal-processing circuitry. The current spikes generated by high-speed digital circuitry can couple back into the sensitive analog circuitry, if circuit designers aren't careful. In the EOS-1D Mark II, Canon's engineers went to the extreme of completely separating analog and digital circuitry onto physically separate circuit boards, each with its own ground plane. It's hard to say just how much this reduced image noise levels, but it's notable that Canon invested the required engineering effort and manufacturing expense to achieve the required separation.....

On 20d

.... I suspect that this advanced noise reduction processing was another consequence of the "active pixel" CMOS technology Canon developed internally. Having active circuitry associated with each pixel in the sensor array allows lots of fancy processing that would be impossible otherwise, and it looks like Canon's noise reduction system takes advantage of this.

In the EOS-20D though, while apparently still using the sophisticated on-chip noise reduction processing we saw in the 10D, Canon has also added an option for conventional dark-frame subtraction as well. Accessed via Custom Function 02, the "Long exposure noise reduction" seems to operate just the same as dark-frame subtraction on other cameras we've seen it on. The difference with the 20D though, is that there's precious little image noise to be subtracted out, at least at exposure times of 30 seconds or less, where I did essentially all my shooting. I can imagine the dark-frame subtraction option being useful for astronomers doing 5-minute exposures with the 20D, but it will add little to most users' image quality.
.....