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Bird size - focal length - distance calculator
This calculator computes one of the following:
focal length, distance, bird size, camera sensor size, bird image size : camera sensor size ratio, scope magnification (if used)
from the remaining parameters.

Category Birding Resources  Bird Photographers Personal Websites 
 
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Tuesday 28th March 2017
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Fatbirder's Top 1000 Birding Websites

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