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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.

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 concentration 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 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.

The filter performance is optimised to give even illumination 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 shutter 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 before 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 compose 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.

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