Scale selection tool for modellers - (follows from 'Scales and real-thing equivalence' thread)

Here's an Excel tool for free download for modellers who prefer to
pick the scale to suit the subject:
formatting link

It's based on three variables, not in this order:
1. How long or wide the real subject is (easy).
2. How far you'll be viewing the model from when drinking beer, e.g.
with magnifying glass, at arm's length, in a display cabinet, hanging
from the ceiling, in the hand of a happy looking child in the garden
3. How much of your field-of-vision you want to fill. This might be
the hardest thing to figure out. However, an ideal viewing arc that's
assumed for setting up a home TV system is 30 degrees of your total
180 degree f.o.v. I think this is angle is big enough to keep your
attention by filling a reasonable amount of your visual field (about
17% of the total). The ability to compete for a reasonable arc of the
visual field probably also accounts for the "show-stopper" effect of
the bigger scales. This angle of 30 degrees is set as the default
viewing arc, but can be changed by the user.
The output is selected from seven common scales: 24th, 32nd, 48th,
72nd, 144th, 350th and 700th, according to which is nearest. (Other
scales are ignored at the moment -- Excel only allows up to seven
nested IF functions in the one equation.).
It can also be used backwards, by changing the viewing distance until
the actual scale is reached; e.g. it will tell you that to view a
1/72nd scale XB-70 Valkyrie lengthwise at a 30 degree arc, you have to
be 5 feet away. The original is about 60 metres (200 ft) long. The
view the single remaining XB-70 at the same arc, you have to be about
120 yards away (which may not be possible...). This could possibly be
useful for un-zoomed photos, but bear in mind that a camera already
starts off with a cropped visual field (of much less than 180
This is just a tool --- it won't necessarily suit someone who'd prefer
to work to a constant scale. However, I think the output probably
supports comments made by modellers about picking a scale that "just
feels right" for the subject.
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