Dariusz Kowalczyk
Nature Photography Gallery

PhotoNature Calculator
(Bird size - focal length - distance calculator)

PhotoNature Calculator - background focal length mm     + scope x a b = mm a/b =
          ( 75 %)

This calculator computes one of the following: from the remaining parameters. It is not applicable for fisheye lenses.

object distance (x) vs focal length
Google Charts

Main Page
From the PhotoNaturalist's Notebook
At the Baltic Sea
Rocky Mountains Wildlife
Other Pictures from West

Sunrise/Sunset Calculator
Solar Position Calculator
Wildlife observations - database templates


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