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FORUMS Photography Talk by Genre Wildlife Talk 
Thread started 04 Jul 2010 (Sunday) 19:14
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Calculating animal size (or any object, given FL, distance and sensorsize)

 
weeatmice
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Jul 04, 2010 19:14 |  #1

Hi,

I'd like to caclulate the size of an animal in one of my images.

I have focal length (400mm) subject distance (73m) and pixel width (on full frame). I think that is enough info right?

I've not found the formula on google. Or at least the one I did, didnt make sense.

Any ideas?


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res
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Jul 05, 2010 06:03 |  #2

Sorry, don't know the formula but if you find an object on land that you can stand 73 m from, you could shoot and get the scale. I know, not as easy as formula.




  
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hollis_f
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Jul 05, 2010 13:03 |  #3

You want a field-of-view calculator. Using the one here (external link), your 400mm lens at 73m will have a horizontal field-of-view of just under 8m.


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weeatmice
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Jul 05, 2010 13:14 |  #4

Thanks, I think I'd just about got there with trig but thats much easier :)


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Calculating animal size (or any object, given FL, distance and sensorsize)
FORUMS Photography Talk by Genre Wildlife Talk 
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