B+W 1057396 Ficha Técnica descarregar pdf (Página 23)

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The quality of high-grade lters is determined by various criteria. Many pho-

tographers are aware that the plane parallelism and transmission proper-

ties of glass and the coating are key factors for image quality. What fewer

of them know is that the lter mount must also meet high requirements as

a link in the high-tech chain. The main purpose of the mount is to hold the

fragile lter glass in place, rmly yet without play, for a long time. However,

the glass must not be subjected to mechanical tension because even the

tiniest deformations can result in visible unsharpness. Nevertheless, the

lter must also be able to withstand a strong grip. And even after frequent

use it must ensure easy and precise attachment and removal. A non-slip

surface quality makes handling easier. The mount thickness should be kept

to a minimum in order to prevent vignetting at short focal lengths.

B+W lter mounts meet these requirements to perfection. As a rule, they

are made of brass on highly accurate CNC machines. The lter glass is

kept in place securely but without tension by a threaded retaining ring that

is manufactured with equal accuracy. Fine grooving on the front makes

attachment easier. Black (or silver) hard-chrome plating, clearly legible

labeling (and usually matte black inside surface) ensure lastingly stable

image quality and functionality. To avoid vignetting in the image corners at

extreme wide angles despite the slim design, B+W provides various mount

types that cater for the different angles of view.

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Strict nal inspections ensure awless lter products Screenprint color for the gold B+W logo on the mount

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B+W 1057396 Ficha Técnica Página 23