Thanks for the suggestion t1ck135. Maybe I will put a thermometer in the lens. It's a good idea. 
Yep, inorganic and organic challenge 
I like it. It's a big one but the first goal of this contest is to learn.
Today, I start the front of the camera. Still in progress ...
P.S : I don't know if I can tell the digital camera model I try to reproduce 
<< A French guy who have some problem in english but who have to live with >>
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