Parts Lens

Parts Lens Cinematography- What is a zoom lens, and what are three important parts of it? A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and th...


Parts Lens

Parts Lens
Cinematography- What is a zoom lens, and what are three important parts of it?

A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view), in contrast to the fixed focal length (FFL) lens or prime lens.

Three important parts: (1) focusing lens, (2) positive (converging) lens[es], and (3) negative (diverging) lens[es].

A zoom lens initially receives light through an afocal zoom system, which may be composed of many lenses, after which the beam passes through a focusing lens, which is similar to a standard, fixed-focal-length photographic lens.

A simple afocal zoom system consists of two positive (converging) lenses of equal focal length (lenses L1 and L3) with a negative (diverging) lens (L2) between them. L2 has an absolute focal length less than half that of the positive lenses. Lens L3 is fixed, but lenses L1 and L2 can be moved axially, and do so in a fixed, non-linear relationship. This movement is usually performed by a complex arrangement of gears and cams in the lens housing, although some modern zoom lenses use computer-controlled servos to perform this positioning. As the negative lens L2 moves from the front to the back of the lens, the lens L1 moves forward and then backward in a parabolic arc. In doing so, the overall angular magnification of the system varies, changing the effective focal length of the complete zoom lens.



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SoundOff Signal ETTMLED-P Traffic Master Amber Lens LED Light with Controller
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NEW Canon PowerShot SX20 IS SX20IS 29 PIECE PRO KIT with usb cable , video cable , software , battery , Owners manual , 5 Years Extended Warranty parts and labor ,3 Piece Lens Cleaning Kit , ,Card case Holds 3 cards , Table top Tripod ultra compact with flexible wire leg , LCD protector ,Soft case ,High Speed card Reader ,16GB SD High Speed Memory Card ,Canon Strap ,Full Size Tripod ,Deluxe Camera Bag ,External Flash ,Set Of 3 high resolution filters, Lens / Filter Tube Adapter, 2X High Resolution Super Telephoto lens, 0.45X High Resolution wide angle Lens, Macro lens Kit, Neoprene Wrist Strap, POP -UP Flash Diffuser, Lens Hood, Extra High Capacity Battery With rapid Charger, Cap Keeper, Rain sleeve ,Professional Dust Blower, Tripod Bag , Adjustable Hand strap , Spider Flexible 7
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Nikon Coolpix L22 12.0MP Digital Camera with 3.6x Optical Zoom and 3.0-Inch LCD (Black)
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Unleashing the Raw Power of Adobe Camera Raw: Master Techniques for Professional Digital Photographers
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Dress up your eyes with a Geo Circle lens

You have tried all the eye color products and make up styles. Now you are in search of a better way to dress up your eyes.  Instead of applying products to your eyelid or eyelashes, you can dress up your eye with a Geo Circle lens. For those who wear contact lenses or glasses the circle lens is a great way to make the eyes stand out and look beautiful. The circle lens will add color and sparkle to your eyes.

The Geo Circle Lens is used just like any other contact lens. It is inserted into your eye and can be worn on a daily basis. The difference between a circle lens and a regular lens is the color and style of the contact. Instead of a traditional clear lens or a lightly colored lens the Geo Circle Lens is made to expand the appearance of your iris and make it much brighter. The lens is made with a brightly colored ring that surrounds the pupil of the eye.

The ring of the Geo Circle Lens can be made in a variety of colors and styles. You can choose a circle lens that is blue, black, or brown. In addition, the lenses can be made with flecks of other colors or a pattern to make the eyes stand out. Some people prefer to wear a style that looks like a flame or a ring that circles the eye.

A Geo Circle Lens can be purchased in any prescription strength. You can even order two different prescriptions. One can be purchased for each eye. You can order each circle lens separately. If one of your eyes needs a stronger prescription you can order only one contact. This is much better than having to order all of your lenses by the pair.

The circle lens is also see-through. Therefore, you don’t have to worry about the circle or pattern interrupting your line of sight. No matter which Geo Circle Lens pattern you choose, only those looking at you will know the difference. You will simply enjoy the benefit of being able to see better when wearing your contact lens.

With a Geo Circle Lens you can enjoy beautiful eyes that stand out. Each lens is made to your prescription and strength so you can enjoy excellent eyesight. Ordering a circle lens is very easy online today. You simple choose your style, enter your prescription, and wait for your lenses to arrive. Most lenses will last for up to a year with proper care and cleaning. Circle contact lenses are cared for with the same solutions and cleaners that other types of lenses are cleaned with.

About the Author

For more information on the Geo Circle lens check out our large selection of products available. We are the only website that offers the Circle lens in the United States. Most products can be shipped from our California office to your home within one week.