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Old Jul 10, 2009, 2:45 PM   #11
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A lens hood is a definite bonus - reduces flare and protects the front element. Whether a petal hood or not depends on the hood design. A petal hood is generally used to prevent vignetting. Whether a hood on a 70-300 needs to be petal depends on how deep the hood is.
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Old Jul 10, 2009, 2:49 PM   #12
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ok, cheers (yet again!) JohnG. So in essence a deep lens hood is what I need be it petal or not?

I was told by yet another "family expert" that the best one are the expensive ones 25 and the cheap 5 ones would not do a job - is this also true - he said it was something to do with the fact that they were screw on (the cheap ones) and they would stop the motor of the lens!
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Old Jul 10, 2009, 10:50 PM   #13
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Petal hoods are generally designed to fit a single lens, and are only used on lenses which have internal focus ( the objective lens does not rotate when focusing). Obviously, a rotating front element would cause the petals to rotate as well, so these type lenses use a cone type hood.

There are many screw in accessories for lenses. None, to my knowledge interfere with the focus motor. Possibly, you could create a problem by holding the hood while the lens is trying to focus.

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Old Jul 11, 2009, 11:17 AM   #14
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Thank you Brian for your help - I really appreciate it!
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