B+W 1057396 Ficha Técnica descarregar pdf (Página 22)

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The trend towards ultra-compact design in

(zoom) lenses does not always leave enough

room for a normal  lter thickness. With

extreme angles of view and very short focal

lengths, marginal rays obliquely incident

at the image corners can be shadowed. To

avoid such vignetting, B+W has developed

the very thin Slim Wide-Angle Filter Mount

without a front thread. The mount is only

three millimeters thick. The Slim polariz-

ing  lter is  ve millimeters thick due to its

thicker glass. In most cases, shots are thus

possible up to 1 mm in  mm format (ap-

prox. 104° angle of view) without vignetting

caused by the  lter mount. Despite their thin

design, the Slim mounts are also charac-

terized by excellent mechanical  nishing.

Precision-engineered retaining rings which

guarantee the lasting, stable attachment

of the high-grade  lter glass. The unique

Käsemann-type polarizing  lters are now

also available in a Slim mount only  mm

thick. The table on page 0 shows which  l-

ters other than in the Standard F-Pro Mount

are also available in the Slim version.

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For even more extreme angles of view

or super-wide angles with a narrow tube

diameter and other special cases such as

lenses with an excessively image circle, the

oversized mount is the ideal solution. In this

special design the mount and the  lter glass

protrude far beyond the screw-in thread.

Even in particularly critical cases, the over-

dimensioned  lter diameter ensures that

light incident at a highly oblique angle in the

corners of the image is not impeded. This

means that vignetting caused by the  lter

is de nitely ruled out. In the critical cases

in which these  lters are used, no lens

hoods should attached as these could cause

vignetting. The B+W Wide-Angle Filters

with oversized mount are available in many

popular sizes.

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The improved Standard Filter Mount F-Pro

has high mechanical stability despite its

shallow design. It can be used on most

wide-angle lenses without the danger of

vignetting. However, exact data regarding

focal length and angle of view limitations

are not possible because vignetting depends

not only on the height of the  lter mount

and the angle of view, but also on the tube

design of the front of the lens. As a guide,

this  lter mount can be used without vignet-

ting on  mm camera lenses (approx. 6°

diagonal angle of view). In addition, most

wide-angle lenses with 28 mm (approx. °

angle of view) and in many cases even with

24 mm (approx. 84° angle of view) can be

combined with the F-Pro mount without the

risk of vignetting. The same angles of view

apply to lenses in digital cameras. Despite

the thinner design, others  lters, snap caps

or lens hoods can be attached easily and

safely to the front thread.

Another advantage of the new F-Pro  lter

mount: the  lter glass is no longer held in

place from the front, but from the back by

the retaining ring. This prevents the retain-

ing ring from being accidentally loosened

during the removal of an additional  lter or

a lens hood that has been screwed in too

tightly. Innovation and excellent material

and manufacturing quality make the Stand-

ard Filter Mount F-Pro a lastingly stable,

rounded piece of high tech.

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Digital photography also bene ts from qual-

ity  lters. The new Digital Pro  lter mount

is geared specially to the design and mount

diameters of digital cameras and camcord-

ers. The silver, hard chrome-plating on

the outside follows the pale color trends of

digital cameras and forms a harmonious

unit with the lenses. In terms of its design,

this high-quality mount is based on the

F-Pro model. There are currently 1 mount

sizes available between 2. and 2 mm.

If required, the range will be extended