## FANDOM

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The F Ratio is the ratio between the focal length $f$ and the diameter $d$ of the lens. Strangely, $f/6$ means that $f/d = 6$

## Fast OpticsEdit

A small F Ratio corresponds to fast optics because $d > f$ which means that more light will pass through the apperture, reducing the time it takes to make an image.

## Slow OpticsEdit

A large F Ratio corresponds to slow optics because $f > d$ which means that the same image will be spread across greater area. To get the same amount of photons per area, we need more exposure time.