« on: February 11, 2015, 06:11:59 PM »
It is definitely possible. There was a rumor...at least a year ago now?...that indicated Canon was working on some kind of active cooling. My guess is there is a fan or heat pipe of some kind in the camera body that moves heat away from the sensor, possibly releasing it along the body.Thanks for the response Jon. I can't say I've ever been in a situation where my camera was hot to touch. It probably doesn't get as hot here.
If the 5Ds is based on the same technology as the 7D II, it should be starting out with significantly lower dark current noise. It's got slightly different pixels, though, so it may not gain the same benefits as the 7D II. Active cooling should certainly help, however if the camera has 0.6e-/s/px dark current at 33C, it's already ludicrously low, so cooling would have a marginal effect. If the dark current is the same as the 6D, then active cooling could help.
One area where it might help more than others is when shooting in sunlight. I've photographed birds on some hot days, and I remember my camera getting very hot to the touch. Some kinds of active cooling (i.e. TEC) could certainly help keep dark current lower in such situations. Heat pipe or fan should also help a little, as a warmed up sensor would still likely be hotter than ambient.
It should also be noted that studies done decades ago showed that cooling does not seem to have any significant impact on read noise, only dark current. So I wouldn't expect any active cooling system to reduce read noise, which would be the primary source of noise if DC was 0.6e-/s/px.
Now you've provided me with some interesting reading to think over. I'll have to do some research on dark current noise. Sounds like I'll be much happier with the 5dsr than the 5d2 if the 6d and 7d2 are already much better. Once again thanks for the response.