 Simone Italia |
Lens Hood Does the Lens Hood help make the image sharper?
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Alan N. Marcus |
Hi Simone, Good question! The job of the camera lens is to project a miniature image of the outside world on the surface of film or digital chip (focal plane). The quality of the image produced is interconnected, in other words, how well the entire camera’s optical system is put together. The idea is to allow the image forming rays to play on the focal plane and to reject periphery, non-image forming rays. All optical systems spawn non-image forming rays. These are stray light rays springing from defects in the lens and rays from strong lights and reflections outside the boundary of picture being taken. The insides of the camera is painted flat black and baffled to deaden the inside walls to reduces internal reflections. The lens itself is coated with anti-reflection material to cut down stray light. All of these countermeasures fail to prevent a high percentage of this stray light from bombarding the focal plane. When the focal plane is bathed with stray rays, the effect is called flare. Flare is far more devastating than you would believe. Flare reduces contrast. This is the ‘snap’ that fine pictures acquire. The less flare the more ‘snap’. Now part of sharpness is perceived. This is not a true optical quality; it is a sensation conceived in the mind’s eye of the observer. The bottom line is, allow less flare and the observe catch sight of a sharper picture. A lens shade is a powerful tool that restricts peripheral rays. This tool reduces flare. The result is an image with a higher perception of sharpness. You can look this up yourself, it falls under the title of ‘simultaneous brightness/contrast effect. Alan Marcus (marginal technical gobbledygook)
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Simone Italia |
Thank You Mr. Marcus!
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Oliver Anderson |
I use Pop instead of Snap. Like when I shoot with my lighting my photos POP due to the separation of my subject and background...clearly from the lens hood. I shoot with the lens hood always inside/out.
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Samuel Smith |
no
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