Science in our everyday life is full of blessings and surprises. Lets coming into the point of camera. Have you ever been noticed that some cameras white? Manufacturer like Canon has the answer.
It's a pretty known camera industry factoid, but perhaps some of you have never heard about it before.
A number of Canon's professional L series lenses — all super-telephoto lenses — are "white" with the distinctive red ring. The color is actually more accurately described as "off-white," "putty," "light gray," or "beige."
"There is a good reason for this," Canon writes over on its European website. "Lenses contain glass elements. These expand with heat."
"This is not usually a problem with compact lenses − the amount of expansion is small," the company says. "But large lenses contain large elements and here expansion can bring a lens close to the limits of its design tolerances. A white surface reflects sunlight, helping to keep the lens cooler."
So in other words, for photographers sitting under the beating sun for long periods of time (e.g. sports and wildlife shooters), the lighter color of the lens helps it from overheating and having its internal optics and image sharpness affected.
Canon Japan writes that white paint first appeared on Canon lenses in 1976 on the FD 600mm f/4.5 and FD 800mm f/5.6.
Over time, due to the widespread usage and desirability of Canon L lenses, the white color became a fantastic marketing feature as well — these days you can easily pick out the distinctive white lenses when watching things like major sporting events, where crowds of pro photographers are gathered.
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