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#11
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The D50 still works
On 2015-08-10 08:57, Whisky-dave wrote:
On Sunday, 9 August 2015 23:00:10 UTC+1, Eric Stevens wrote: On Sun, 9 Aug 2015 11:24:30 -0400, Alan Browne wrote: On 2015-08-07 20:07, Eric Stevens wrote: On Fri, 7 Aug 2015 16:04:34 -0700 (PDT), RichA wrote: On Friday, 7 August 2015 18:13:52 UTC-4, Tony Cooper wrote: I mentioned I keep an old Nikon D50 that I bought for cheap in the trunk of my car as a back-up. Someone asked if the Florida heat is a problem. Returning from an errand earlier today I saw a pair of Sandhill cranes in my yard. I pulled out the D50 and took a photo. https://tonycooper.smugmug.com/Curre...08-07-3-X2.jpg The heat doesn't seem to have bothered the camera. I added the vignette only because the background is a little blah. I am glad someone asked. The battery was low, so it's charging now. -- Tony Cooper - Orlando, Florida Plastic bodied cameras are ok with heat as long as they aren't in direct sunlight. Then they heat up like ovens. However, worst case, noise goes up a bit. They are no worse in this respect than any other black-bodied camera. Only by chance! Specific heat is generally given by mass. But since plastics are generally less dense than metals one would have to compare by volume in the context of metal v. plastic cameras. "dense" plastics have heat density of around 1.7 j/gK wheras metals are closer to 1. Magnesium's density is about 1.75 g cm^-3 whereas polycarb is about 1.2 g cm^-3. In the end, close to a wash. I'd expect, however, when taken out of sunlight for the metal camera to cool quicker because of the better conductivity (heat) of metal. It's germane to note than in home air exchangers the heat exchanger is made of plastic for many reasons. (Economy in material and manufacturing, very thin walls (conductivity), resistance to corrosion, etc.) We are not talking about transient heating but a situation where the temperature of the camera comes into equilibrium. The temperature of the camera will eventually be that of the inside of the car unless the camera is in the sun, in which case solar absorbtion and later reradiation will have to be taken into account. The color and the suface finish is the primary factor as far as radiation is concerned. It doesn't matter whether the camera is made of metal or plastic. It will get at least as hot as the inside of the car. -- Would there be other effects as that's why canon have the grey series of lens. Long barreled lenses which are often white don't heat up as quick in the sun. Whether this is optically beneficial (mechanical distortion of one side of the lens barrel being warmer than the other) I haven't seen anything mentioned with real results. |
#12
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The D50 still works
In article ,
Whisky-dave wrote: Would there be other effects as that's why canon have the grey series of lens. canon's white lenses are mainly marketing. you an easily pick out the canon users in a crowd. at sporting events, there is often a sea of white lenses. that's no accident and has a lot more to do with marketing than it does heat. |
#13
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The D50 still works
On Mon, 10 Aug 2015 05:57:21 -0700 (PDT), Whisky-dave
wrote: On Sunday, 9 August 2015 23:00:10 UTC+1, Eric Stevens wrote: On Sun, 9 Aug 2015 11:24:30 -0400, Alan Browne wrote: On 2015-08-07 20:07, Eric Stevens wrote: On Fri, 7 Aug 2015 16:04:34 -0700 (PDT), RichA wrote: On Friday, 7 August 2015 18:13:52 UTC-4, Tony Cooper wrote: I mentioned I keep an old Nikon D50 that I bought for cheap in the trunk of my car as a back-up. Someone asked if the Florida heat is a problem. Returning from an errand earlier today I saw a pair of Sandhill cranes in my yard. I pulled out the D50 and took a photo. https://tonycooper.smugmug.com/Curre...08-07-3-X2.jpg The heat doesn't seem to have bothered the camera. I added the vignette only because the background is a little blah. I am glad someone asked. The battery was low, so it's charging now. -- Tony Cooper - Orlando, Florida Plastic bodied cameras are ok with heat as long as they aren't in direct sunlight. Then they heat up like ovens. However, worst case, noise goes up a bit. They are no worse in this respect than any other black-bodied camera. Only by chance! Specific heat is generally given by mass. But since plastics are generally less dense than metals one would have to compare by volume in the context of metal v. plastic cameras. "dense" plastics have heat density of around 1.7 j/gK wheras metals are closer to 1. Magnesium's density is about 1.75 g cm^-3 whereas polycarb is about 1.2 g cm^-3. In the end, close to a wash. I'd expect, however, when taken out of sunlight for the metal camera to cool quicker because of the better conductivity (heat) of metal. It's germane to note than in home air exchangers the heat exchanger is made of plastic for many reasons. (Economy in material and manufacturing, very thin walls (conductivity), resistance to corrosion, etc.) We are not talking about transient heating but a situation where the temperature of the camera comes into equilibrium. The temperature of the camera will eventually be that of the inside of the car unless the camera is in the sun, in which case solar absorbtion and later reradiation will have to be taken into account. The color and the suface finish is the primary factor as far as radiation is concerned. It doesn't matter whether the camera is made of metal or plastic. It will get at least as hot as the inside of the car. -- Regards, Eric Stevens Would there be other effects as that's why canon have the grey series of lens. Marketing. To distinguish them from Nikon -- Regards, Eric Stevens |
#14
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The D50 still works
On Mon, 10 Aug 2015 10:55:15 -0400, Alan Browne
wrote: On 2015-08-09 18:00, Eric Stevens wrote: On Sun, 9 Aug 2015 11:24:30 -0400, Alan Browne wrote: On 2015-08-07 20:07, Eric Stevens wrote: On Fri, 7 Aug 2015 16:04:34 -0700 (PDT), RichA wrote: On Friday, 7 August 2015 18:13:52 UTC-4, Tony Cooper wrote: I mentioned I keep an old Nikon D50 that I bought for cheap in the trunk of my car as a back-up. Someone asked if the Florida heat is a problem. Returning from an errand earlier today I saw a pair of Sandhill cranes in my yard. I pulled out the D50 and took a photo. https://tonycooper.smugmug.com/Curre...08-07-3-X2.jpg The heat doesn't seem to have bothered the camera. I added the vignette only because the background is a little blah. I am glad someone asked. The battery was low, so it's charging now. -- Tony Cooper - Orlando, Florida Plastic bodied cameras are ok with heat as long as they aren't in direct sunlight. Then they heat up like ovens. However, worst case, noise goes up a bit. They are no worse in this respect than any other black-bodied camera. Only by chance! Specific heat is generally given by mass. But since plastics are generally less dense than metals one would have to compare by volume in the context of metal v. plastic cameras. "dense" plastics have heat density of around 1.7 j/gK wheras metals are closer to 1. Magnesium's density is about 1.75 g cm^-3 whereas polycarb is about 1.2 g cm^-3. In the end, close to a wash. I'd expect, however, when taken out of sunlight for the metal camera to cool quicker because of the better conductivity (heat) of metal. It's germane to note than in home air exchangers the heat exchanger is made of plastic for many reasons. (Economy in material and manufacturing, very thin walls (conductivity), resistance to corrosion, etc.) We are not talking about transient heating but a situation where the temperature of the camera comes into equilibrium. The temperature of the camera will eventually be that of the inside of the car unless the camera is in the sun, in which case solar absorbtion and later reradiation will have to be taken into account. The color and the suface finish is the primary factor as far as radiation is concerned. It doesn't matter whether the camera is made of metal or plastic. It will get at least as hot as the inside of the car. a) It does matter because the plastic is thermally resistant (compared to metal), so even as it blackbody's away heat, that occurs at the surface. Heat inside the camera will have a slower go of reaching the surface to be radiated away. But that won't make a significant difference, unless the temperature is changing fast. b) Rich brought up the direct sunlight case. -- Regards, Eric Stevens |
#15
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The D50 still works
In article , Eric Stevens
wrote: Would there be other effects as that's why canon have the grey series of lens. Marketing. To distinguish them from Nikon unless the nikon user has one of these: http://www.bhphotovideo.com/bnh/cont...tlist&A=detail s&Q=&sku=278173&is=USA |
#16
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The D50 still works
On Mon, 10 Aug 2015 22:13:39 -0400, nospam
wrote: In article , Eric Stevens wrote: Would there be other effects as that's why canon have the grey series of lens. Marketing. To distinguish them from Nikon unless the nikon user has one of these: http://www.bhphotovideo.com/bnh/controller/home;?O=productlist&A=details&Q=&sku=278173&is=USA I tried to a lens that color when I bought my 70~200 several years ago. I found they were only available in Japan. I don't know if that was always the case. -- Regards, Eric Stevens |
#17
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The D50 still works
In article , Eric Stevens
wrote: Would there be other effects as that's why canon have the grey series of lens. Marketing. To distinguish them from Nikon unless the nikon user has one of these: http://www.bhphotovideo.com/bnh/cont...t&A=details&Q= &sku=278173&is=USA I tried to a lens that color when I bought my 70~200 several years ago. I found they were only available in Japan. I don't know if that was always the case. that is correct. the white version was only offered in japan because some japanese customers preferred white over black. otherwise, it's the same lens. |
#18
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The D50 still works
On 2015-08-10 21:20, Eric Stevens wrote:
On Mon, 10 Aug 2015 10:55:15 -0400, Alan Browne wrote: On 2015-08-09 18:00, Eric Stevens wrote: On Sun, 9 Aug 2015 11:24:30 -0400, Alan Browne wrote: On 2015-08-07 20:07, Eric Stevens wrote: On Fri, 7 Aug 2015 16:04:34 -0700 (PDT), RichA wrote: On Friday, 7 August 2015 18:13:52 UTC-4, Tony Cooper wrote: I mentioned I keep an old Nikon D50 that I bought for cheap in the trunk of my car as a back-up. Someone asked if the Florida heat is a problem. Returning from an errand earlier today I saw a pair of Sandhill cranes in my yard. I pulled out the D50 and took a photo. https://tonycooper.smugmug.com/Curre...08-07-3-X2.jpg The heat doesn't seem to have bothered the camera. I added the vignette only because the background is a little blah. I am glad someone asked. The battery was low, so it's charging now. -- Tony Cooper - Orlando, Florida Plastic bodied cameras are ok with heat as long as they aren't in direct sunlight. Then they heat up like ovens. However, worst case, noise goes up a bit. They are no worse in this respect than any other black-bodied camera. Only by chance! Specific heat is generally given by mass. But since plastics are generally less dense than metals one would have to compare by volume in the context of metal v. plastic cameras. "dense" plastics have heat density of around 1.7 j/gK wheras metals are closer to 1. Magnesium's density is about 1.75 g cm^-3 whereas polycarb is about 1.2 g cm^-3. In the end, close to a wash. I'd expect, however, when taken out of sunlight for the metal camera to cool quicker because of the better conductivity (heat) of metal. It's germane to note than in home air exchangers the heat exchanger is made of plastic for many reasons. (Economy in material and manufacturing, very thin walls (conductivity), resistance to corrosion, etc.) We are not talking about transient heating but a situation where the temperature of the camera comes into equilibrium. The temperature of the camera will eventually be that of the inside of the car unless the camera is in the sun, in which case solar absorbtion and later reradiation will have to be taken into account. The color and the suface finish is the primary factor as far as radiation is concerned. It doesn't matter whether the camera is made of metal or plastic. It will get at least as hot as the inside of the car. a) It does matter because the plastic is thermally resistant (compared to metal), so even as it blackbody's away heat, that occurs at the surface. Heat inside the camera will have a slower go of reaching the surface to be radiated away. But that won't make a significant difference, unless the temperature is changing fast. There are a lot of variables. The construction of a plastic camera demands thicker structures in some areas but allows for thinner walls in others. Conversely a metal camera can't be made with thin walls (manufacturing issues) where there is no need for structure but might not need as much metal volume even where there's strucural need. Is it a wash? Don't know. Is it significant? Probably not in the end. |
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