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Originally Posted by Stephen Fox
I once read, the only time not use a lens hood is when using flash. Like a lemming I simply followed this without challenge or reason. I dare say the only time to definitely use a hood is with flash.
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Light is light whatever its source. Stray light entering a lens degrades the image. Ultra Wides and zooms are worse due to the number of elements. My 80-200 f2.8 has a modest 16 elements in 11 groups ..... plenty for the stray light to bounce off in all directions. I cannot remember how many reviews I have read in the past where uncontrolled flare leading to poor image quality was put down to a poorly designed lens hood.
The best hood I had was for my Bronica. It was a bellows type and could be racked in or out to suit whatever lens with great precision.
Don