Focal Reikan

Started May 7, 2012 | Discussions thread
TimR32225
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Shortcut method for chart distance...
In reply to SpartanWarrior, May 8, 2012

rwbaron wrote:

50 times 200mm = 10,000 mm's.

To convert to inches divide 10,000 by 25.4 = 393.7.

To convert to feet divide by 12 = 32.8.

Shortcut method is to just take the focal length in mm and multiply by .164 .

That gives you the target distance in feet.

(200 x .164 = 32.8)

That's easier than doing the longer calcuation each time.
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