Sony Alpha SLT-A77V 사양 - 페이지 15

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Fixed Focal Length Lenses

Fixed focal length lenses, commonly known as "prime lens"

or simply as "primes," can complement your photographic

vision in a number of ways. Although most of the focal

lengths offered are also available with zoom lenses, some

special-purpose lenses are only available as primes: fisheye

lenses and most true macro lenses are examples. And

since the optical path only needs to work at one focal

length, it can be optimized to deliver a level of optical

performance that is a cut above the average zoom. But

many photographers like working with a fixed focal length

simply because it always gives them the same angle of view

and perspective, making it easier to pre-visualize what the

camera will see and thus providing the most consistent,

intuitive shooting experience.

A mode, 1/200 sec., F7.1, -0.3 EV, ISO 200, Auto white balance; Photo: Yuji Nukui

Fisheye

16mm F2.8 Fisheye SAL16F28

180° angle of view on full-frame cameras

Curvilinear perspective for unique, expansive images

Crisp image quality throughout the focus range

Four selectable internal filter settings

At 16 mm

100

Once a scientific tool but now a favorite of creative photographers,

fisheye lenses forgo the restraints of rectilinear perspective—the

complex "correction" that is required to keep straight lines looking

straight—to deliver expansive images that cover an extremely wide

angle of view with curvilinear perspective. The SAL16F28 provides

an extremely wide 180° angle of view on 35mm full-frame format

cameras ( 110° on APS-C format cameras ) . In addition to eye-catching

interpretations of reality, it offers extended depth of field so that you

can capture huge vistas in which everything from 20 centimeters to

infinity is sharp, even at maximum aperture. Since the bulging front

Distance from optical center of lens (mm)

element and wide angle of view prevent the use of external screw-in

Max. aperture

F8 aperture

filters, four selectable internal filter settings are provided: normal, O56

Spatial frequency

monochrome, B12 red reduction and A12 blue reduction.

10 line pairs/mm

30 line pairs/mm

• Weight (approx): 400 g

R: Radial values T: Tangential values

• Dimensions (Dia. x L): 75 x 66.5 mm

• Max. magnification ratio: 0.15x