Here's an Excel tool for free download for modellers who prefer to pick the scale to suit the subject:
- How long or wide the real subject is (easy).
- 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 next-door...
- 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
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 degrees).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.
Regards,
Nick.