Tulip lens shade
Oct 8, 2014 09:35:25 #
As mentioned, they are the most efficient way of blocking extraneous ( non image forming) light from entering the lens and bouncing around causing reduced contrast and uneven tones ( "flare"). Also, important for protecting the front lens element from bumps and abrasion.....
Oct 8, 2014 09:44:43 #
sirlensalot wrote:
Reduces or possibly eliminates flare when shooting into the sun.
The only thing that will reduce flare or diffraction when shooting directly into the sun is to change position so that you are not shooting directly into the sun or perhaps a ND filter.
Oct 8, 2014 11:15:35 #
RWR wrote:
The function of all lens hoods is to prevent indirect light from striking the front element.
Yes, it prevents lens flare.
The tulip shape is due to the sensor shape. It is necessary for wide angle lenses.
Oct 8, 2014 11:17:00 #
ebrunner wrote:
Let's not forget that if it has a funky shape, you are going to think it is something special. Marketing does enter into the equation.
Marketing isn't involved in this case. It is all about geometry.
Oct 8, 2014 11:17:01 #
ebrunner wrote:
Let's not forget that if it has a funky shape, you are going to think it is something special. Marketing does enter into the equation.
Marketing isn't involved in this case. It is all about geometry.
Oct 8, 2014 11:17:02 #
ebrunner wrote:
Let's not forget that if it has a funky shape, you are going to think it is something special. Marketing does enter into the equation.
Marketing isn't involved in this case. It is all about geometry.
Oct 8, 2014 11:17:02 #
ebrunner wrote:
Let's not forget that if it has a funky shape, you are going to think it is something special. Marketing does enter into the equation.
Marketing isn't involved in this case. It is all about geometry.
Oct 8, 2014 11:17:03 #
ebrunner wrote:
Let's not forget that if it has a funky shape, you are going to think it is something special. Marketing does enter into the equation.
Marketing isn't involved in this case. It is all about geometry.
Oct 8, 2014 11:27:37 #
mwsilvers
Loc: Central New Jersey
Ohicu wrote:
What is its function? Field of view, Sun angle or what?
Primarily designed to reduce lens flare. It also provides some significant protection to the front element from bangs, and deflects objects coming from the side. Of course it provides no protection against small objects like a pieces or gravel hitting the lens straight on. A couple of caveats. It's often difficult to adjust a circular polarizer with a lens hood attached. Second, if you use a lens hood on some lenses, usually zooms, and use a built in flash, you may notice a shadow area where the hood intersected the path of the flash. It's not an issue with a hot shoe mounted flash.
Oct 8, 2014 11:39:35 #
RWR
Loc: La Mesa, CA
MtnMan wrote:
Marketing isn't involved in this case. It is all about geometry.
You're absolutely right. (Five times, in fact! :lol: )
Oct 8, 2014 12:16:22 #
romanticf16
Loc: Commerce Twp, MI
Ohicu wrote:
What is its function? Field of view, Sun angle or what?
The
tulip shape is a compromise for zoom lenses that go from wide to tele. The cutouts allow the wide to not vignette while the longer portions still shade the top and bottom when the lens is in the tele position.
Oct 8, 2014 21:26:56 #
phlash46 wrote:
Typically used on zooms; keeps vignetting to a minimum at various focal lengths.
The tulip shape is actually, primarily for wide angle lenses as some one already stated, it's made that way so it won't show un in the image! So it does not matter if it is a zoom lens or a prime. On the zoom lenses, the reason you see them there a lot is, because they are made to be able to shade the lens at it's longest focal length, part of the horizontal coverage has to be removed, so they don't show up in the short part of the focal length.
Oct 9, 2014 05:53:34 #
Oct 9, 2014 06:01:30 #
Leitz
Loc: Solms
RWR wrote:
Right. I was thinking "stray", but inadvertently wrote "direct."
In fact you wrote "indirect," which would be correct. Non-imaging light, which is indirect or, as you say, stray, light striking the lens can degrade the image and this a proper hood can prevent.
Oct 9, 2014 07:29:53 #
Pablo8 wrote:
....................................The lens-hoods for the Hasselblad (and Mamiya C33)are square, to match the square format that they use.
HUH!!!! I did not know that!! every once in a while you can teach an old dog something new!!!
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