I have never touch a 300D but it looks like that the whole body (external)
is covered by plastic, plastic has low heat transmission so it doesn't
transmit heat/cold well to your hand and that is my main point about why it
feel not as hot.
C.H.Ling
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
> 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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