Hasselblad XPan II - Manual (Page 29)

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When using negative film, however, natural light fall-
off present in traditional optical printing set-ups (most
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 may be no need to use a centre filter.
29
The only way 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 concentra-
tion of neutral density at the centre and a progressive
reduction of density towards the outer edge. The effect
at the centre of the filter corresponds to a 1 f-stop re-
duction 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.
The filter performance is optimised to give even illu-
mination at larger or medium sized apertures.
Tips & Reminders
Photographers normally used to working with SLR
cameras should particularly check that the lens cap has
been removed when making exposures. Flashing shut-
ter speed and flashing low exposure symbol warning
appear in the viewfinder.
Take care if using other types of lens shade or filter hold-
ers. As the XPan II does not have a TTL viewing system
it will be difficult to judge effects and possible vignetting.
They may also obscure the rangefinder optics and cause
visual focusing difficulties through the viewfinder.
Regularly check that the controls are set correctly be-
fore you take a photograph. For example, you may have
set the camera at ASA/ISO override for a previous film
and have forgotten to reset the Auto DX code setting.
Or perhaps you have forgotten to reset an exposure
compensation.
When using the panorama format, ensure that you com-
pose accurately, or at least allow a margin for error. If
you decide to crop an image later, to level a horizon for
instance, you may be forced to mask off slightly more
than normal compared to a similar correction in the
standard format, owing to the panorama format's greater
length.