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Old February 13th, 2007, 06:08 PM
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SLR experts: why a "flower" shaped lens hood?

Looking at SLR lenses, I see that some come with a "flower" shaped lens hood, or shade.

So I wonder... why the "petals", instead of a solid hood?
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Old February 13th, 2007, 06:15 PM
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Interesting question and I'd wondered the same thing - according to this link it's all to do with the aspect ratio of the sensor.

http://www.cambridgeincolour.com/tut...lens-flare.htm

Tony
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Old February 13th, 2007, 06:15 PM
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Quote:
Originally Posted by Byron Gale View Post
Looking at SLR lenses, I see that some come with a "flower" shaped lens hood, or shade.

So I wonder... why the "petals", instead of a solid hood?
The "petals" block light along the top, bottom and sides of the sensor. You normally see these hoods on zooms. With a normal hood, there would be vignetting, especially at the wide end of a zoom. Keep in mind that sensors (and film frames) are rectangular but the lens casts light in a circular pattern. Hope that makes sense.
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Old February 13th, 2007, 06:17 PM
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Byron,
Just my best guess....The petal shaped lens hood usually comes with wide angle lenses. A full hood may cause vignetting and it's a little heavier.
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Old February 13th, 2007, 06:59 PM
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using a circular polarizer (from old film camera) on a digital - I have to watch for the corners being "darkened". On the corners of those shades - no shade so they won't show up on the image.
~bruce
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