Heat managment?

[Mike Prevette]

I haven't seen a ton of info about how the Red One manages heat. I see the vents at the base of the camera, and if it is indeed an aluminum body it should dissipate heat fairly quickly. The operating temperature changes greatly for some of these cameras over the course of a day. I'm interested in what steps have been taken to manage the heat change, calibrate the sensor and a/d path, etc.


With the original f900, and the Phantoms you have to black balance every half hour or so to maintain a consistent signal. It's almost as though the manufacturers never even gave it any thought. I'd like to avoid that here.

_mike

[RED-DAVE]

Especially while shooting on one of those 100+ degree days in So-Cal. Very interested in any insight!

[Brook Willard]

The cameras at NAB - which were on from about 8:30 AM until 6:30 PM - never got above what one might consider "warm" to the touch.

[Mike Prevette]

Yes, but how much did the S/N ratio change? I'm not talking as much about body heat here, I'm talking about internal temperature, and calibration steps to stay ahead of it in the data path.

I am impressed if the running times quoted for the 140wh batts it two hours, that means the camera is pulling 70wh. Think of the heat a 60 watt bulb generates over the course of two hours inside a confined area.

_mike

[Andrew M.]

I red it somewhere that for low light shots usually you have low ambient temperature.
And there was whole discussion how much of S/N you loose when CMOS is running hot.
I wonder how Misterium will change it black level in time when temperature will be increasing. There is some 50 lines of pixels reserved for auto-calibration, will be this on the fly or at certain intervals?

I found good reading about CMOS technology. Bit old (2001) but gives you easy explanation. Also author hints that CMOS will be the choice for the large 4K and 8K sensors. Hmm…. 2001 and he was right on mark, unless the CCD research will come up with some breakthrough.
http://www.noao.edu/meetings/lsst/kozlowski.pdf

[Anders Holck]

Well a lightbulb emits 95% of the consumed energy as heat. The red design would be pretty inefficient to be anything like that :-)

[Stuart English]

If anyone placed their hands on the top of the NAB cameras they'd appreciate that the camera body seems to be running somewhat cooler than a Panasonic Varicam which has a very good reputation for reliability in hostile environments.

[Graeme Nattress]

I was totally disappointed at not being able to fry an egg on the prototypes, and I was hungry too....

Graeme

[jbeale]

Well a lightbulb emits 95% of the consumed energy as heat. The red design would be pretty inefficient to be anything like that :-)

I presume that was a joke... as you probably know, any computer, camera, or other electronic device ends up putting out 100% of the energy input as heat.

For a light bulb, some of it is visible light, so that doesn't enter into the thermal equilbrium of the lightbulb itself (but even that ends up as heat after it's absorbed by whatever the light hits.) A camera may have some small energy outputs as light from viewfinder or LCD backlight, and power in electrical signals going through the data output cables, but that's going to be a tiny fraction of the whole.

[Ken Corben]

If anyone placed their hands on the top of the NAB cameras they'd appreciate that the camera body seems to be running somewhat cooler than a Panasonic Varicam which has a very good reputation for reliability in hostile environments.

Ya, that was the first thing I did was feel the top, bottom and sides of the powered cameras. Negligible really. I look forward to testing Shakira in the Arctic, the Kalahari and underwater.

[Jochen Schmidt-Hambrock]

Whe bubbles form on the outside of the underwater housing, or the camera visibly sinks into the ice, you have your answer.
;-)
Jochen

[ericyoung]

...I look forward to testing Shakira in the Arctic, the Kalahari and underwater.

You've already christened your Red One! :)

[Phil Becque]

If anyone placed their hands on the top of the NAB cameras they'd appreciate that the camera body seems to be running somewhat cooler than a Panasonic Varicam which has a very good reputation for reliability in hostile environments.

Hi Stuart, I hope I'm not speaking out of turn as it were; but I remember you saying something about the heat dissipation at NAB to 3-4 of us who were interested in working in high temp zones e.g. Africa. Do you want to elaborate a little? What you said on the day made perfect sense to me.

Thanks, Phil