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Bokeh Calc

iPhone / iPad
  • Utilities
  • Photo & Video
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This App calculates the bokeh diameter before you actually take photos such as portrait or macro photos.

It is just for predicting relative bokeh diameter, not for editing your photos.

Bokeh phenomenon occurs on objects which is out of focus. But, calculation of the bokeh size is complicated.

Although it is not well known, the bokeh size can be easily calculated when you define the bokeh size as follows: the bokeh is originated from a pin-pointed illuminant located at infinity, and its size is an apparent diameter measured at the focused object. In this case, the bokeh diameter is determined only by a focal length and F value. Any other factors never influence that.

Why don't you get fine photos with highly controlled bokeh, using this app?

It is also useful when you select lenses.

Visit "App Support" site to learn more.
Or follow us on @SlideCalcL on Twitter for contact.
We want to hear from you. Please rate this App.

----- BASIC USAGE -----

-- Input the focal length of your lens and the F value you use.

-- The bokeh diameter is shown at the middle of the screen.

-- Image of bokeh is displayed at the upper side.

-- The [i] button allows you to go to the information screen where you can contact developer, support site, etc.

----- CAUTION -----

-- Please input a true focal length, not a 35mm-corresponding value.

-- Notice that actual specs of your lens are not exactly the same as catalog specs.