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3 results for “focus”

Formulae (3)

r = \frac{a(1-e^2)}{1 + e\cos\theta}

Planets orbit the Sun in ellipses with the Sun at one focus.

DoF \approx \frac{2 N c\, s^2}{f^2}

Range of distances that appear acceptably sharp.

H = \frac{f^2}{N c} + f

Focus distance that keeps everything from H/2 to infinity sharp.