film labs
and
mini-labs) automatically compensates
for this to a
greater
extent
in
the
print. Therefore, when
using
negative film and with the lens stopped
down,
there
maybe no need to use a centre filter.
The onlyway to eliminate light fall-off at the corners is
to reduce the amount of exposure
at
the centre
of
the
image. The
Centre
filter XPan works
by a concentration
ofneutral density at the centre and a
progressive
reduc-
tion of
density
towards the outer edge. The effect at the
centre
ofthe filter
corresponds to a 1 f-stop reduction
in exposure.
The filter
is
multi-coated
to ensure
high
anti-reflection
quality.
No degradation in MTF is
seen and there is no
shift in
focus.
J
Photographers normally
used
to
working with
SLR cam-
eras should
particularly
check that
the
lens
cap
has
been
removed
when making exposures.Aflashing red
warning appears in
the
viewfinder.
f
Toke
care if usi ng other types of lens
shade or fi lter
hold-
ers.
As the XPan
does
not have
a TTL viewing system it
will
be difficult to
judge
effects and
possible
vignetting.
They moy
also obscure the
rangefinder
optics ond cause
vis ua
I fo
cusi n
g
d iffi
cu
lti
es th
ro
ug
h
t
h
e
viewfi
nd e r.
I
Regularly
check that the controls are
set
correctly
be-
fore
you
take a
photograph.For
example,you may
have
set
the camera at ASNISO
override
for
a
previous
film
and
have
forgotten
to
reset
the
Auto DX
code setting.
Or
perhapsyou
have inadvertently
moved
the exposure
compensator dial or forgotten to reset it.
I
When
using the
panoramo
format,
ensure that
you
compose occurately, or at
least
allow a margin for
er-
ror. lf
you
decide to crop an
image later,to
level a hori-
zon for instance,you moy
be
forced
to
mask
off slightly
more than
normal
compared to a similar correction in
the standard
formot,
owing to the
panorama
format's
greoter
length.
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