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Objetivos > Objetivos SLR

24-200mm f3.5-5.6 AF AT-X Pentax AF
Tokina

24-200mm f3.5-5.6 AF AT-X Pentax AF
Angular Zoom Montura Pentax K


Características

Observaciones The AT-X 242 AF is the first lens to start at 24mm and zoom all the way to 200mm, and is currently the widest zoom range available starting at 24mm. It is constructed using a chrome plated brass mount plate and a combination of aluminum and composite lens barrels to reduce weight while maintaining strength and durability.
Optically, the 242 uses high quality optical glass multicoated lens elements created by Hoya Corporation, the world?s largest manufacturer of optical glass. Two Aspherical lens elements and one SD (super low dispersion) glass element are employed in the optical design to insure sharpness across the film plane. The aspherical elements are each molded as one piece of optical glass rather than a resin laminated to a glass core.
An internal focusing mechanism gives this lens fast auto focus. Internal focus means the 72mm filter threads do not move during focusing. This is of great advantage when a special effects filter, such as a circular polarizer, is used. With an internal focusing lens it is not necessary to readjust the position of the filter every time the focus is changed. Focus distance is indicated on the manual focus ring.
Like the rest of the lenses in the AT-X series, The AT-X 242 AF is what is commonly referred to as a parafocal lens, meaning when focus is achieved at a telephoto focal length, it is possible to zoom back to a wide angle and maintain focus on the subject.
Características Técnicas - Focal length 24 to 200mm
Maximum aperture f/3.5-5.6
Minimum aperture f/22
Optical construction 15 elements in 13 groups
Aspherical elements Two
SD glass 2 elements
Coatings Multi-layer
Angle of view 84° 10? to 12° 20?
Minimum focus distance 0.8m (2.9 ft.)
Reproduction ratio 1: 5.97
Focusing system Internal focusing
Zooming system Rotary type
Number of diaphragm blades 6
Filter size 72mm
Maximum outer diameter 81.8mm (3.2in.)
Overall length 89.0 mm
Weight 90 g
Accessories, included edicated lens hood, fitted soft case
Warranty 3 years

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