-Fresnel lens - condenser lens used on a spotlight to gather together the rays of light coming from a source and direct them into a narrow beam.
Fresnel lens
Bokeh (Japanese "boke" = blur or haze) is how the lens draws unsharp image areas. The effect becomes
Bokeh ...
Fresnel lens
Diffraction grating
[edit] External links
Zone plate: A quasi-scientific explanation
Soft X-ray microscopy
Making a photographic zone plate
Examples of zone plate photographs ...
The Fresnel lens makes the screen much brighter, especially with normal and wide lenses. Every SLR camera has one; otherwise the corners of the viewfinder would be dark.
I tried a fresnel lens made by Arca-Swiss. The illumination is a bit more even than before, but I don't find the image to be much brighter.
The rays of light produced by the Fresnel lens of the spotlight sharply separates the highlights from the shadow areas. A spotlight can create a visual sense of subject shape and bulk.
The VX125B comes with a Fresnel lens. I purchased Toyo's accessory long bellows and standard metal 54mm tripod mounting block. I used the long bellows and metal tripod mounting block with the VX125B standards on my Toyo CX's 450mm monorail.
Spotlight
Is an artificial light source using a Fresnel lens, reflector, and simple focusing system to produce a strong beam of light of controllable width.
SQF
Subjective Quality Factor. Essentially a lens rating system.
These accessories are simply plastic Fresnel lenses you can attach to your flash unit's head with tape or velcro. They concentrate the light much like a zooming head and give you an extra couple stops of light, at the cost of coverage area.
The Alpha 1600 is the junior version of the 18K and 4K Alphas, and has a compact body with a fresnel lens.
Angenieux Optimo 28-340mm T3.2, 19.5-94mm T2.6, & Optimo Servo Unit ...
For flash fill at extended distances Walt Anderson's Better Beamer is a portable and inexpensive way to nearly double the distance you can project your flash. Basically a simple Fresnel lens on a plastic mount it is a must have for anyone doing flash ...
Studio flashes can be equipped with diverse accessories, such as softboxes, filters, reflectors, Fresnel lenses etc. to achieve special lighting or effects.
Fresnel lenses focus light into a narrower beam.
Diffusion screens made of translucent plastic, paper, or fabric, are placed in front of a light to soften it.
Honeycomb grids make light more specular and less diffuse.
 See also: Lens, Photograph, Light, Camera, Photography
  
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