Steve'sDigicams

JohnG · Jul 10, 2009, 1:45 PM

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.

HTFC · Jul 10, 2009, 1:49 PM

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!

VTphotog · Jul 10, 2009, 9:50 PM

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.

brian

HTFC · Jul 11, 2009, 10:17 AM

Thank you Brian for your help - I really appreciate it!

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Jul 10, 2009, 1:45 PM	#11
JohnG Moderator Join Date: Aug 2004 Posts: 8,529	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.

Jul 10, 2009, 1:49 PM	#12
HTFC Junior Member Join Date: Jul 2009 Location: Harrogate Posts: 27	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!

Jul 10, 2009, 9:50 PM	#13
VTphotog Senior Member Join Date: Mar 2005 Location: Extreme Northeastern Vermont, USA Posts: 4,309	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. brian

Jul 11, 2009, 10:17 AM	#14
HTFC Junior Member Join Date: Jul 2009 Location: Harrogate Posts: 27	Thank you Brian for your help - I really appreciate it!