This software contains features that will enable
photographers to make more effective use of their
photographic equipment. The examples are intended to guide
the user how to make best use of the programme at the same
time as solving potential photographic problems. We are
aware that the focusing marks on lenses are limited and
have attempted to limit the examples to practical
situations. What we have attempted to do is to put them in
a way that is a practical and effective means of solving
photographic equations without the user having to worry
about any calculations or formula. These calculations are
not suitable for any photographic extremes, such as using a
telephoto lens in the extreme close-up range to achieve a
long working distance or reversing a wide angle lens on
extension tubes to photograph in the macro range. When it
comes to lenses manufacturers tend to round the figures.
For example, a lens may actually be 147mm, but the
manufacturer will call it a 150mm lens. This means that any
calculations may not agree exactly with those quoted by the
manufacturer. For details of the camera formats supported
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