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02-22-2016, 07:05 PM   #721
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I have a simple cooling solution if anyone finds their K-1 is overheating- send the camera to me and I promise to use it outside. We've had a bit of a sissy winter but it will still be -11C tonight and I'd bet that could handle any heat problems with mechanical SR and video*. I'll even pay for one way postage.


*we should start a mass petition to Pentax to get this enabled

02-22-2016, 07:48 PM - 1 Like   #722
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QuoteOriginally posted by BrianR Quote
I have a simple cooling solution if anyone finds their K-1 is overheating- send the camera to me and I promise to use it outside. We've had a bit of a sissy winter but it will still be -11C tonight and I'd bet that could handle any heat problems with mechanical SR and video*. I'll even pay for one way postage.


*we should start a mass petition to Pentax to get this enabled

39 degrees here. I wouldn't be able to take it from the bag, I'd have to pour it out ...
02-22-2016, 09:04 PM   #723
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14 heritage lenses supported...

I saw mention of this; does anybody know which ones? Let's hope for the FA*'s.


Cheers,
Cameron
02-23-2016, 06:00 AM - 1 Like   #724
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QuoteOriginally posted by clackers Quote
39 degrees here. I wouldn't be able to take it from the bag, I'd have to pour it out ...
On the positive side, if you can find the battery terminals in the puddle to check the voltage it will probably be high enough to power the camera.

02-23-2016, 07:52 AM   #725
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QuoteOriginally posted by D1N0 Quote
Even if it as fixed it is still a floating sensor system. Moving it about would give of heat quicker.
Air has terrible thermal conductivity. to be effective at all Air needs a way to escape for convective cooling, how would you implement that in a weather sealed camera body?

QuoteOriginally posted by clackers Quote
a fixed sensor can be embedded in a metal heat sink.
Correct, MFDB even have copper heatsinks and fans to help cool the sensors.
02-23-2016, 08:36 AM   #726
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QuoteOriginally posted by Digitalis Quote
Air has terrible thermal conductivity
Quite true this. This isn't a simple problem to fix. Adding mass to a moving sensor (so the sensor heats up more slowly) or increasing the viscosity of the medium the sensor moves in (say to water or something with better thermal conductivity) will result in more heat, because it takes more energy to move the sensor and when the sensor eventually comes to a stop, that energy is converted from motion to heat. The only solution that comes to my mind is a closed air circulation system with a heat sink away from the sensor that radiates heat outside the camera (hand warmers in the grip?), which would require a larger body to implement.
02-23-2016, 08:45 AM   #727
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QuoteOriginally posted by RGlasel Quote
Adding mass to a moving sensor (so the sensor heats up more slowly) or increasing the viscosity of the medium the sensor moves in (say to water or something with better thermal conductivity) will result in more heat, because it takes more energy to move the sensor and when the sensor eventually comes to a stop, that energy is converted from motion to heat.
This would render the IBIS system useless as the sensors movements would be slower, to counteract the amount of drag you would also need to put more power into the magnets moving the sensor carriage and that would make even more heat

.
QuoteOriginally posted by RGlasel Quote
The only solution that comes to my mind is a closed air circulation system with a heat sink away from the sensor that radiates heat outside the camera (hand warmers in the grip?), which would require a larger body to implement.
A similar concept to a heat pipe - however you're still faced with the problem of removing the heat from the system. And as I recall, heat pipes can only operate under finely tuned temperatures - at temperatures above or below their operating temp, thermal conductivity is limited to that of the casing itself, the heat transmitting fluid within is either completely vaporized from heat or solidified from excessive cold.
02-23-2016, 08:46 AM   #728
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If you somehow ionised the air, could it be then become subject to electro-magnetism, and hence be forced to circulate via a mechanism like SR?

02-23-2016, 08:53 AM   #729
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QuoteOriginally posted by rawr Quote
If you somehow ionised the air, could it be then become subject to electro-magnetism
To do that would probably require magnets with a tremendous amount of power to have an appreciable effect. We are talking about 2 perhaps 3 Teslas, easily strong enough to make the internal stainless steel substructure of the K-1 implode.

Last edited by Digitalis; 02-23-2016 at 09:06 AM.
02-23-2016, 09:04 AM   #730
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QuoteOriginally posted by Digitalis Quote
To do that would probably require magnets with a tremendous amount of power.
The ionisation could be via [crudely] a spark plug. Then magnets to stimulate and steer the airflow.
02-23-2016, 09:07 AM - 2 Likes   #731
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Maybe add a tube with two clenched rubber apertures, on top and bottom, so the camera could exhaust hot air, while still remaining WR? Sure, every 2 min the rubber sphincters would open up and PFFFRRRTTT release the warm gasses right in the photographer's face, but its a technology worth pursuing
02-23-2016, 09:10 AM   #732
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QuoteOriginally posted by rawr Quote
The ionisation could be via [crudely] a spark plug. Then magnets to stimulate and steer the airflow.
Incidentally: Ionization is an electrostatic effect not a magnetic one. A magnet will not repel charged particles, but it will deflect them. And strong electrostatic charges are well known for utterly destroying sensitive electronics.

I Would use peltier effect cooling ( as energy inefficient as it is) It is compact and reasonably efficient for cooling....but there would still be the problem of removing the heat from wherever the peltier effect cooler dumps it.

Last edited by Digitalis; 02-23-2016 at 09:17 AM.
02-23-2016, 09:11 AM   #733
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I think a microwave generator would be a more efficient way of generating heat. That's what you're trying to do with all those powerful electromagnets and "spark plugs", right?
02-23-2016, 09:20 AM   #734
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QuoteOriginally posted by Na Horuk Quote
Sure, every 2 min the rubber sphincters would open up and PFFFRRRTTT release the warm gasses right in the photographer's face, but its a technology worth pursuing
Excellent idea!
Such rubber sphincters would be great in Pentax marketing literature. Probably help the camera sell very well in the same markets where glass coffee tables also apparently sell well.
02-23-2016, 09:28 AM   #735
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QuoteOriginally posted by Digitalis Quote
Air has terrible thermal conductivity. to be effective at all Air needs a way to escape for convective cooling, how would you implement that in a weather sealed camera body?
My point was that sr doesn't do much to generate extra heat, it would sooner cool down the sensor. Unless there is a heat sink applied in sr=off mode, heat cannot be the reason why sr is turned of in video. And even if it is you could still get a few minutes of video with it on, so we should have a choice. We don't so I think there is another reason. Likely a stupid one.
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