C.H.Ling wrote:
>I believe the different is mainly due to metal has higher heat capacity
>
Not so sure about that, but it's been a long time since I studied
physics. I don't know about the plastic used in these things vs.
leatherette/metal. But isn't the camera frame metal? Do magnesium and
aluminum have higher or lower heat capacity than brass?
>and better heat transmission.
>
Certainly. The lower heat conductivity may be an advantage at first, but
once the heat is inside, it will take longer to cool, too. Conductivity
is a 2 way street.
>It always feel hoter and cooler than plastic when touched.
>
Yes, higher conductivity has that effect. But there is a very real
difference in heat absorption from radiant energy, principally sunlight,
based on the reflectance of the finish color. Go out on a nice hot sunny
day. Put your hand on a white car. Then, carefully, start to put it on a
black car. Better, use a thermal measuring gun and save your hand from
the burn. One of the interesting things I've observed about the US
Northeast vs Southwest, is the very different color makeup of the
vehicles on the road.
Moose
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