The pale colour definitely keeps them cooler in the hot summer conditions up here, my black lenses (16-35 and 24-105L) get red hot, whereas the 100-400 stays coolish. The quality is jusy unsurpassed - I'd never use anything else on the Canon body (I have used my L lenses on 20D, 30D, 1DMkIIN and my current 1DsMkII).
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