Why no "off the sensor" metering?

Started Dec 5, 2012 | Discussions thread
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Jack Hogan
Veteran MemberPosts: 4,931Gear list
Re: Why no "off the sensor" metering? Because they do?
In reply to hjulenissen, Dec 7, 2012

hjulenissen wrote:

You seem to imply that sensor heating is a significant reason why we need long exposure noise reduction. I thought that this was mainly due to hot pixels?

Yes, hot pixels are one of the symptoms of thermal noise.  Several other components of DSLR noise are negatively affected by temperature (e.g. dark current and amp glow).

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