The Amazing D200.

Started 10 months ago | Discussions thread
Cytokine
Contributing MemberPosts: 626
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Re: Scientists not convinced by CMOS develop Scientific-cmos
In reply to olliess, 9 months ago

olliess wrote:

Cytokine wrote:

"Broadly speaking however, and despite some undeniably rapid advances over the last decade, ‘traditional’ CIS performance has generally been worse than CCDs and their acceptance into scientific markets has been limited due to a reputation of unacceptably high read noise and dark current, lower fill factors, and greater non- uniformity.

"These are all drawbacks that our new sCMOS technology has been specifically designed to overcome."

"These have been conceived in order to match the traditionally high fidelity imaging performance of CCDs with the readout speed capabilities of CMOS."

http://www.scmos.com/files/low/scmos_white_paper_2mb.pdf

I think it's hard to compare specialized scientific imaging sensors with those produced for the professional (and consumer) DSLR market. The cost and usage constraints are just way different.

For example, I think that most DSLR users would NOT be interested in a $10,000, 16-MP astronomical CCD that requires water cooling for best performance.

Oliess, I posted these quotations and link, because the two sensors are almost diametrically opposed in the way they work, therefore it is not surprising that some people can see a difference.

Actually the two sensor types compliment each other, and allow photographers to choose the right tool for the job in hand.

This is also the case in some scientific applications where CMOS is used to differentiate between high level light signal analysis, and CCD for low level light signal analysis, both complimenting each other.

CCD has better pixel dynamic range and CMOS better system dynamic range (given enough light).

CCD gives a cleaner signal that gets relatively dirtier when amplified, CMOS gives a dirtier signal that gets relatively cleaner when amplified, but it needs some light to work otherwise we are just left with a dirty signal.

John

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