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DPChallenge Forums >> Hardware and Software >> difference between different lens hood shapes
Showing posts 1 - 7 of 7, (reverse)
09/28/2007 03:34:26 AM · #1

Have another question for the dpc masses. Been searching the forums a bit on lens hoods... found it interesting to see recommendations for not using UV filters for lens protection in there. I've always wondered about them affecting quality. I had a tiffen one and noticed a difference so upgraded to hoya... but from reading the threads its got me thinking lol...

But my question is about lens hoods which i didn't seem to come across and answer for. What is the difference between the two shapes (full long circle or short cut out types). Aside from better protection, is one just cheaper then the other, are their specific uses or situations for each type?

Many thanks in advance,

09/28/2007 03:55:37 AM · #2
the difference comes from the viewing angle (not sure what's the exact name) of the lens.
typically, with wide angle, it is very large so the hood would come in the view if it was not cut out. For longer zooms, the angle is much smaller so it is easier to have a "full" hood.


Message edited by author 2007-09-28 04:50:06.
09/28/2007 04:19:07 AM · #3
Lens hoods

Message edited by author 2007-09-28 04:19:32.
09/28/2007 08:56:13 AM · #4
Originally posted by mouten:

the difference comes from the viewing angle (not sure what's the exact name) of the lens.

It's called "field of view".

And you're exactly right.
09/28/2007 09:24:29 AM · #5
Petal shaped hoods are designed to minimize vignetting. The cut out areas match the corners of the frame to help keep them from getting dark. Of course, the hood will only align with the corners if those corners don't move, so you won't find petal shaped hoods on lenses with rotating front elements.
09/28/2007 09:40:29 AM · #6
The petal shape is the result of the intersection of the rectangular pyramid defined by the lens' widest field or view with a near cylindrical cone that is roughly defined by the diameter of the lens barrel.
09/28/2007 12:31:34 PM · #7
Interesting information here.. before you decide to purchase anything, you might want to experiment with "rolling your own" lens hoods at //www.lenshoods.co.uk/.
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