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09-23-2006, 07:23 AM   #1
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Stupid Question re Lens Hoods

Okay, I'm going to show my ignorance regarding DSLRs.

My DA 18-55 lens came with a "petal" style lens hood.

My DA 50-300 lens came with a "normal" style lens hood.

Is there a reason for the different lens hood styles for different lenses? Or can any lens hood be used with any lens (as long as the diameter matches, of course)?

To me, the petal style has a more appealing look to it, so I'm curious to know why one lens came with one style of hood and the other with a different style.

09-23-2006, 07:42 AM   #2
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Hi-

First of all, there are no stupid questions! (Except those left unasked.)

The petal hood is designed to not obscure the corners of the frame at shorter focal lengths. The kit lens at 18mm needs it, the 50-300mm is fine. To be honest, I'm not 100% certain of this because the kit lens is the first (and only) lens I've had with a hood, but I'm pretty sure I've got it straight. I think I'll get hoods for some of my other lenses, though, it makes a big difference.

Julie
09-23-2006, 09:25 AM   #3
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The primary criteria for which lens hood would fit is the focal length of the lens at the widest setting. The secondary criteria is the design of the lens (placement of optical elements, size of the barrel, largest f/stop). Any lens hood designed for an 18mm lens "might" work on the 18-55 (provided that it can be mounted), but then again, it might not. A non-fitting hood will cause the coreners to go dark.

A petal shaped lens hood can be designed much more compact than a round or square hood. A round hood for an 18mm would be a monster. I have a round hood for my FA 20mm lens. I rarely use the hood because of its size. It's like a plate for a teacup with a hole in the middle! No way the lens with hood will fit in my canera bag.

A hood designed for, say 35mm can be used on any longer focal lengths (if it otherwise fits), but it won't be as effective as a dedicated hood for that focal length.

Here are two excellent articles on lens hoods and vigneting with illustrations of the lens hood shapes:

http://www.vanwalree.com/optics/lenshood.html

http://www.vanwalree.com/optics/vignetting.html
09-23-2006, 10:02 AM   #4
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Thank you both! I'm feeling smarter already...

So, based on the lenshood link, sounds like I could use the petal hood on the 50-200, although doing so may result in greater likelihood of lens flare, especially at the telephoto end.


Last edited by MPrince; 09-23-2006 at 10:24 AM.
09-23-2006, 01:44 PM   #5
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That's correct.
09-28-2006, 10:56 AM   #6
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Lens Hoods

Hello All! This is my first post here been lurking in the wings reading all the good comments and info. I thought I would throw in my 2 cents. An important point to remember, make sure the lens on which you are installing a petal type hood is an internal focus (IF) lens, or that the front element does not rotate while focusing. Otherwise, the hood will never be correctly oriented in relation to the vertical or horizontal.

Last edited by Snoopy; 09-28-2006 at 11:01 AM. Reason: additional text
10-21-2006, 12:43 AM   #7
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Wow, great info. I just picked up the DA 50-200 and wondered why it wasn't also petal-shaped like the one that came with the kit lens on my K100D. I guess I should be careful not to swap them since they both fit each other. Thanks!
10-21-2006, 05:17 AM   #8
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You can use the petal hood on the 50-200 if you want, just be aware that doing so may increase the likelihood of lens flare, especially as you get closer to 200mm.

05-30-2007, 11:43 AM   #9
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Removable section

On my PH-RBA 52mm hood which came with my 18-55DA lens there's a small removable section of the hood, clearly embossed with ribbing, an arrow and the word "OPEN".

What's that for?

Thanks.

--Steve
05-30-2007, 12:19 PM   #10
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It's for a small lever that is on the circular polarizer. Without that little hole, you would not be able to use polarizer while having lens hood on.
05-30-2007, 12:51 PM   #11
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QuoteOriginally posted by Branimir Quote
It's for a small lever that is on the circular polarizer. Without that little hole, you would not be able to use polarizer while having lens hood on.
It is for the circular polarizer yes, but you can use a polarizer w/o removing the little window. I do all the time. Some circular polarizers don't have a little lever just some knurling on the moveable part of the filter.

NaCl(just a bit of clarification)H2O
05-30-2007, 07:01 PM   #12
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Me too, I rotate the polariser without taking that little thingy out of the hood.
06-05-2007, 04:37 PM   #13
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I have just recently purchased a Pentax F 50mm f1.7, and was wondering if a hood would be useful and if so where would someone purchase one.
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