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the length of the camera's baseplate and screw the bolt clockwise into the tripod socket a few turns. Ensure the alignment pin on the plate matches its respective socket in the camera baseplate and continue to screw the bolt until it is securely attached.

Spirit Level

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The dual-directional spirit level simply fits into the flash hot-shoe and provides a check for both horizontal and vertical photography. This can be particularly useful when photographing buildings, for example. In these cases the use of a tripod or stable camera support is particularly recommended.

Ensure, however, that it is fitted correctly; see illustra- tions. Note the difference depending on whether the camera is in the horizontal or the vertical position. Check that the spirit-level has been pushed all the way into the shoe as far as it will go. Remember that the spirit level is intended to be an aid in levelling and cannot guarantee complete accuracy. Check the image carefully in the viewfinder.

UV-Sky filter

The UV-Sky filter XPan (3054460) is designed for use with the Hasselblad 4/45mm and the Hasselblad

4/90mm lenses. The filter absorbs some of the ultraviolet rays present in light, which cause the appearance of haze, particularly noticeable in photography at high altitudes, for example. The use of a UV-Sky filter can reduce this effect somewhat and also cause a slight warming of tone on colour film.

The filter can safely be left on the lens for most photographic applications as it provides some protection for the lens' front element not only against dust and rain etc but also against scratches and accidental damage.

The filter is multi-coated to ensure high anti-reflection quality. No degradation in MTF is seen and there is no shift in focus.

Centre filter XPan for 45mm

The Centre filter XPan for 45 mm (3054453) is designed for use only with the Hasselblad 4/45-mm lens (3024015).

The 45 mm lens is free from vignetting with panorama format images at lens aperture settings smaller than f/8. However, natural light fall-off (a basic law of phys- ics) reduces the exposure at the corners of the image by roughly 1 f-stop.

This light fall-off at the corners causes visible effects in critical photography when using transparency film.

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