Practical
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4. Exposures with filters
The thread
of
the lens 4 or the lens hood mount takes a screw-in filter:
• 30.5 x 0.5 for Sonnar lensed models (35S 1 35SE)
• 24.0 x 0.5 for Tessar lensed models (Original35
1 35T)
Filters mostly require an exposure correction. Its value
is
engraved
on
the filter mount. This indicates the
number
of
stops by which the aperture has to
be
opened (towards lower f/numbers) or the exposure time
increased.
For example
if
the measured aperture is
f/11
, and the filter correction value -1.5
(i.e.
1 1/2 aperture stops),
use an aperture setting between f/8 and f/5.6
If
y ou want to correct by increasing the exposure time, moving the shutter speed dial from one value to
the next corresponds to a full exposure step correction.
Half
steps can only
be
allowed for by intermediate
aperture settings.
Filters for
black
and
white shots:
Medium yellow filter: (
exposure correction -1.5). This makes the sky reproduce dar ker, clouds more
brilliant and improves modelling in snow shadows.
Orange
filter: (exposure correction -1.5 to -3, according to the film type used). This darkens blue skies to
give heavy thunderstorm effects and lightens yellows and reds.
Filters for colour shots:
Filter
UV
and
colour conversion filter R 1.5: (these require no exposure correction). They subdue blue
casts which can arise on cloudless days through the predominant blue skylight, especially in distant views.
With sorne reversai colour films a warmer overall rendering may
be
desirable. In that case the R 1.5 filter
may
be
used for all shots.
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All
this informations, texts,
and
Images were extractedfrom the "Rollei 35/
35T
/
35S
In Practical Use"
and
only in tends to give sorne orientation to new
us
ers that didn 't
had
access to the original manual. (c)
Rollei-Werke Franke
& Weidecke
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