B+W 72E (093) MRC F-Pro 1057410 Manuel D’Utilisation
Codes de produits
1057410
4
5
B+W FILT ER T ECHNOLOGY
or. In other words, it takes away something from
white light, so that less light is reflected than it would
be by each color individually. Therefore this kind of
color mixing is called “subtractive color mixing”. If
we once again mix red and green, but in the “subtrac-
tive” manner just mentioned, for instance with wa-
tercolors, the resulting mixture will not be brighter
than each individual color and yellow as it was with
the spotlights, but darker and brown-black.
white light, so that less light is reflected than it would
be by each color individually. Therefore this kind of
color mixing is called “subtractive color mixing”. If
we once again mix red and green, but in the “subtrac-
tive” manner just mentioned, for instance with wa-
tercolors, the resulting mixture will not be brighter
than each individual color and yellow as it was with
the spotlights, but darker and brown-black.
The effect of color filters
Colored filter glass absorbs a certain portion of its
complementary color from the incoming light and
lets the rest pass through. A yellow photographic
filter, for example, absorbs part of the blue compo-
nent of light and lets the rest, which is a mixture of
all the other colors, appear as yellowish. For certain
technical applications, however, there are special
“yellow” filters (narrow band pass filters) that ab-
sorb not only a portion of the blue light, but all col-
ors other than yellow. When colored light instead of
white light passes through a yellow filter for black-
and-white photography, a portion of the blue com-
ponent of the colorful mixture is absorbed and its
brightness is altered. Photographed through a yellow
filter, a blue sky is rendered noticeably darker, the
gray values of green foliage and grass with low blue
component are hardly changed at all, yellow- or or-
ange-colored blossoms without a blue component
do not lose any brightness, so that they appear
lighter in relation to other colors that have been re-
produced in darker shades. A filter in front of a lens
therefore reduces the overall brightness in propor-
tion to its density. This is taken into account and
corrected automatically by TTL exposure metering.
complementary color from the incoming light and
lets the rest pass through. A yellow photographic
filter, for example, absorbs part of the blue compo-
nent of light and lets the rest, which is a mixture of
all the other colors, appear as yellowish. For certain
technical applications, however, there are special
“yellow” filters (narrow band pass filters) that ab-
sorb not only a portion of the blue light, but all col-
ors other than yellow. When colored light instead of
white light passes through a yellow filter for black-
and-white photography, a portion of the blue com-
ponent of the colorful mixture is absorbed and its
brightness is altered. Photographed through a yellow
filter, a blue sky is rendered noticeably darker, the
gray values of green foliage and grass with low blue
component are hardly changed at all, yellow- or or-
ange-colored blossoms without a blue component
do not lose any brightness, so that they appear
lighter in relation to other colors that have been re-
produced in darker shades. A filter in front of a lens
therefore reduces the overall brightness in propor-
tion to its density. This is taken into account and
corrected automatically by TTL exposure metering.
Optical and mechanical quality
Because photographic filters are positioned in the
image-forming optical light path, they should only
have the labeled absorption characteristics and no
other optical effects in order not to diminish picture
quality. The surfaces must be precisely plano-parallel
(without bulges and tapering), with perfect smooth-
ness (irregularities lead to stray light and a soft focus
effect), their glass must be optically homogeneous
and completely clear (no striae or cloudiness), and
their surfaces must be as free of reflections as pos-
sible (to avoid stray light and double-/ghost images).
image-forming optical light path, they should only
have the labeled absorption characteristics and no
other optical effects in order not to diminish picture
quality. The surfaces must be precisely plano-parallel
(without bulges and tapering), with perfect smooth-
ness (irregularities lead to stray light and a soft focus
effect), their glass must be optically homogeneous
and completely clear (no striae or cloudiness), and
their surfaces must be as free of reflections as pos-
sible (to avoid stray light and double-/ghost images).
The most modern manufacturing technology
That is why professionals and photographic enthusi-
asts around the world insist on B+W quality filters.
B+W has been manufacturing filters for the most
diverse applications for more than 50 years. This
extensive experience has produced a unique know-
how in glass and optical anti-reflection coatings. This,
in conjunction with Schott optical glasses, state-of-
the-art finishing machines and continuous quality
control lead to top products for the world market.
asts around the world insist on B+W quality filters.
B+W has been manufacturing filters for the most
diverse applications for more than 50 years. This
extensive experience has produced a unique know-
how in glass and optical anti-reflection coatings. This,
in conjunction with Schott optical glasses, state-of-
the-art finishing machines and continuous quality
control lead to top products for the world market.
The top priority of B+W
is the utilizing the highest
possible optical quality
glass, as well as the highest
quality filter mount
is the utilizing the highest
possible optical quality
glass, as well as the highest
quality filter mount
B+W continues to maintain the
cutting edge coating technology
cutting edge coating technology