B+W 34E Digital PRO UV/IR CUT (486) 1002822 User Manual
Product codes
1002822
64
65
¡0000
9000
8000
7000
7000
6000
5000
4000
3000
2000
2500
3500
4500
¡00
200
300
400
500
¡50
250
350
450
Mired
Kelvin
550
KR ¡,5
KR 3
KR 6
KB ¡,5
KB 3
KB 3
KB 6
KB ¡2
KB ¡5
KR ¡,5
KR 3
KR 6
KB ¡,5
KB 3
KB 3
KB 6
KB ¡2
KB ¡5
KR ¡2
KB 20
KB 20
0
1
2
3
4
0,5
¡,5
2,5
3,5
4,5
5
1
5
¡0
¡5 20
30 40
2
3
4
6
8
7
¡0000
9000
8000
7000
7000
6000
5000
4000
3000
2000
2500
3500
4500
¡00
200
300
400
500
¡50
250
350
450
Mired
Kelvin
550
KR ¡.5
KR 3
KR 6
KB ¡.5
KB 3
KB 3
KB 6
KB ¡2
KB ¡5
KR ¡.5
KR 3
KR 6
KB ¡.5
KB 3
KB 3
KB 6
KB ¡2
KB ¡5
KR ¡2
KB 20
KB 20
Mired diagram
Mired and Decamired (= ¡0 Mired) are units used for
describing the corrective effect of LB- or conversion
filters (pages ¡8 to 2¡). These units are convenient
because identical differences between Kelvin values,
like those of light and film, require much smaller cor-
rections at high color temperatures than they do at
low color temperatures, whereas identical Mired dif-
ferences always correspond to identical effects. That
is why it is practical to convert the Kelvin values of
light and color film into Mired values for finding the
right filter strength, as described on page ¡8. Those
who prefer an easier method rather than performing
computations can use the following table to find the
Kelvin- and Mired values for various light conditions
and the correct filters for the color reversal film that
is being used (note the direction of the arrow).
describing the corrective effect of LB- or conversion
filters (pages ¡8 to 2¡). These units are convenient
because identical differences between Kelvin values,
like those of light and film, require much smaller cor-
rections at high color temperatures than they do at
low color temperatures, whereas identical Mired dif-
ferences always correspond to identical effects. That
is why it is practical to convert the Kelvin values of
light and color film into Mired values for finding the
right filter strength, as described on page ¡8. Those
who prefer an easier method rather than performing
computations can use the following table to find the
Kelvin- and Mired values for various light conditions
and the correct filters for the color reversal film that
is being used (note the direction of the arrow).
Filter fac tors
The transmission curves on the preceding spread on
the pages 60 and 6¡ show the result of absorption or
reflection (the latter in the case of interference fil-
ters) of different portions of the incoming light that
vary in accordance with their wavelengths. In other
words, a filter doesn’t add light, but rather withholds
light from the lens. A yellow filter, for example, does
not add the color yellow as the name might suggest
– instead it attenuates or blocks the complementary
color blue.
This removal of portions of light also results in the
reduction of the amount of illumination that reaches
the film, which has to be compensated by means of
an increase in exposure. With TTL (through-the-
lens) exposure metering, this is taken into account
automatically, so that in most cases the photogra-
pher does not need to compensate any further.
However, not every camera offers TTL metering.
Also, TTL may not be accurate when strong or nar-
row pass filters are being used, such as orange filters
and dense red filters. Furthermore, TTL is highly
unreliable with UV- and infrared filters because the
spectral sensitivity of the metering cells does not
match that of the films with sufficient accuracy.
That is the reason why the descriptions of B+W fil-
ters always include a filter factor by which the expo-
sures of average subjects have to be increased. Thus
a 2x filter factor means that the exposure time has
to be doubled to compensate for the loss of light
that results from the effect of the filter. The filter
factor always applies to the exposure time (or shut-
ter speed), not to the aperture value!
However, because the shutter speeds on most cam-
eras can only be changed in full exposure steps (in
accordance with factors 2, 4, 8, ¡6, 32, …), and filter
factors often have uneven intermediate values, in
practice corrections are seldom made by means of
the shutter speed, but by the aperture.
The table below shows what filter factor corre-
sponds to how many aperture stops. Intermediate
values can be rounded up or down, because small
deviations are absorbed by the exposure latitude of
the film without a noticeable effect on the picture.
Corrections can also be made with shutter speeds
and f-stops provided the correction is shared by
both parameters.
the pages 60 and 6¡ show the result of absorption or
reflection (the latter in the case of interference fil-
ters) of different portions of the incoming light that
vary in accordance with their wavelengths. In other
words, a filter doesn’t add light, but rather withholds
light from the lens. A yellow filter, for example, does
not add the color yellow as the name might suggest
– instead it attenuates or blocks the complementary
color blue.
This removal of portions of light also results in the
reduction of the amount of illumination that reaches
the film, which has to be compensated by means of
an increase in exposure. With TTL (through-the-
lens) exposure metering, this is taken into account
automatically, so that in most cases the photogra-
pher does not need to compensate any further.
However, not every camera offers TTL metering.
Also, TTL may not be accurate when strong or nar-
row pass filters are being used, such as orange filters
and dense red filters. Furthermore, TTL is highly
unreliable with UV- and infrared filters because the
spectral sensitivity of the metering cells does not
match that of the films with sufficient accuracy.
That is the reason why the descriptions of B+W fil-
ters always include a filter factor by which the expo-
sures of average subjects have to be increased. Thus
a 2x filter factor means that the exposure time has
to be doubled to compensate for the loss of light
that results from the effect of the filter. The filter
factor always applies to the exposure time (or shut-
ter speed), not to the aperture value!
However, because the shutter speeds on most cam-
eras can only be changed in full exposure steps (in
accordance with factors 2, 4, 8, ¡6, 32, …), and filter
factors often have uneven intermediate values, in
practice corrections are seldom made by means of
the shutter speed, but by the aperture.
The table below shows what filter factor corre-
sponds to how many aperture stops. Intermediate
values can be rounded up or down, because small
deviations are absorbed by the exposure latitude of
the film without a noticeable effect on the picture.
Corrections can also be made with shutter speeds
and f-stops provided the correction is shared by
both parameters.
Daylight Film
Tungsten Film
Imprint
Publisher Jos. Schneider Optische Werke GmbH, Business Unit B+W Filters
D-55543 Bad Kreuznach, Ringstr. ¡32, Phone +49 (0)67¡ 60¡-¡25
Text Walter E. Schön DGPh, D-8¡673 Munich (incl. tables, diagrams)
Product photos Peter Lebeda, Jos. Schneider Optische Werke GmbH
Sample photos Martin Blume (mb), Konrad Götz (kg)
Sample photos Martin Blume (mb), Konrad Götz (kg)
Peter Lebeda (pl), Jos. Schneider Optische Werke GmbH
Thorsten Meywald (tm), Jos. Schneider Optische Werke GmbH
Page 2 pl (2), tm (2); Page 5 pl (¡), tm (3); Page 8 tm (¡); Page ¡0
tm (6); Pages ¡2/¡3 pl (¡); Page ¡4 tm (7); Pages ¡6/¡7 tm (¡); Page ¡8
tm (2), pl (¡); Page 20 tm (6); Pages 24/25 kg (¡); Page 26 tm (3);
Page 28 pl (2), tm (2); Pages 30/3¡ mb (¡); Page 32 pl (2); Page 34
pl (4); S. 36/37 tm (¡); Page 38 tm (3); Page 40 tm (7);Page 42 tm (4);
Page 44 tm (5); Pages 46/47 pl (¡); Page 48 pl (5); Pages 50/5¡ tm (¡)
tm (2), pl (¡); Page 20 tm (6); Pages 24/25 kg (¡); Page 26 tm (3);
Page 28 pl (2), tm (2); Pages 30/3¡ mb (¡); Page 32 pl (2); Page 34
pl (4); S. 36/37 tm (¡); Page 38 tm (3); Page 40 tm (7);Page 42 tm (4);
Page 44 tm (5); Pages 46/47 pl (¡); Page 48 pl (5); Pages 50/5¡ tm (¡)
Layout, Design Digital Design Borgers GmbH, D-655¡0 Hünstetten-Wallrabenstein
Printing Druckerei Gras & Jung GmbH & Co. KG, D-55543 Bad Kreuznach
F I L T E R F A K T O R S / M I R E D / I M P R I N T
Clear blue sky, in the shade
Daylight, foggy weather
Daylight, overcast sky
Daylight, overcast sky
Sunlight, blue sky
Sunlight, white clouds
Sunlight, mornings/evenings
Sunlight shortly before sundown
Sunlight, mornings/evenings
Sunlight shortly before sundown
Fluorescent Tube “White” (+CC)
Moonlight, Carbon Arc Lamp
Fluorescent Tube “Warm” (+CC)
Halogen Bulb (Nominal Voltage)
Halogen Bulb (Mains Voltage)
Krypton Bulb 500 Watts
Krypton Bulb 500 Watts
Household Bulb ¡00 Watt
Household Bulb 60 Watt
Household Bulb 25 Watt
Household Bulb 25 Watt
Acetylene Flame
Incandescent Gaslight
Candlelight, Kerosene Lamp WS
Conversion Filter
f-stops
Factor
1
5
¡0
¡5 20
30 40
2
3
4
6
8
7
0
1
2
3
4
0.5
¡.5
2.5
3.5
4.5
5