Zoom Lenses

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Zoom lens - A zoom lens is a mechanical assembly of lenses whose focal length can be changed, as opposed to a prime lens, which has a fixed focal length. They are commonly used with still and video cameras, some binoculars and telescopes, and other optical instruments.

Prime lens - In film and photography, a prime lens is a mechanical assembly of lenses whose focal length is fixed, as opposed to a zoom lens, which has a variable focal length. Prime lenses are not as versatile as their zoom counterparts, but are often of superior optical quality and lower cost.

Breathing (lens) - 'Breathing' refers to when a lens' optics change the apparent focal length slightly when attempting to shift the mechanical focus (the actual zoom ring does not move). More expensive lenses attempt to minimize this effect.

Follow shot - Follow shot is a specific camera shot in which the subject being filmed is seemingly pursued by the camera. The follow shot can be achieved through tracking devices, panning, the use of a crane, and zoom lenses resulting in different qualitative images but, nevertheless, recording a subject (performer) in motion.

Suggested Web Sites

Navitar Inc - Manufacturer and supplier of high resolution C-mount and large format inspection lenses for machine vision inspection applications. Products range from zoom lenses to fixed magnification and compact designs.

Cheng-Hsian Enterprise Co., Ltd. - Taiwanese OEM and ODM manufacturer of color ccd cameras, color dome cameras, infrared illuminators, fixed iris lenses, manual iris lenses, zoom lenses.

Canon Lenses - Features life-size photographs of different prime and zoom lenses, specifications tables, and owner comments.

Source: BazSites.com

Web Links

3x Optical Zoom - 3x Optical Zoom Olympus C-3000 Zoom - The Olympus C-3000 Zoom is a self-contained color digital camera system, produced by the Olympus ...

1 Ae Canon Manual - ... 1.6x indicated focal length compared to 35mm format) Shutter Speed 1/4000 to 30 Second(s) Optical Zoom Not Applicable Focus Mode Auto Focus - One-Shot, Predictive AI Servo, AI Focus Manual Focus Focus Distance 13 ... www.tonsofspecials.com/sales.php?7695 Canon 5.0 MP PowerShot S2 IS Digital Camera w/ 12x Optical Zoom Display & Graphics Display Screen 1.8" TFT Color LCD 115 KiloPixels p-Si (PolySilicon) Effective Resolution 5. ...

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