You can also get this information using ExifToolGui available here:
https://www.portablefreeware.com/index.php?id=1450
I have not tried it for Canon or JPG, but for Nikon and Olympus RAW you
can find it as Focus Distance under the Maker Tab.
There is also a simple formula for finding the distance to an object if
you know the size of the target. For example, for a bird you can use an
average size to estimate how far away it is.
John Riegsecker
Gig Harbor
On 10/15/2021 1:10 PM,
dgrainger at birdsbydave.com wrote:
>
This is known to me to be true with Nikon and Canon cameras, I do not
>
know whether it is true for other makes.
>
>
Photographers that process using Photoshop or Lightroom can determine
>
fairly precisely how far away their subject was from the camera by a
>
simple method. Here's how it works:
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>
In Photoshop, open an image (doesn't matter whether RAW or TIFF or JPG)
>
and then chose File menu at top of screen, scroll down to File Info and
>
click on that. Next, within File Info, at the bottom of the resulting
>
menu, you will see RAW Data at bottom. Click on RAW Data, which will
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expose all of the EXIF information. That will look a lot like a Chinese
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Restaurant Menu in complexity, but, "not to worry" , as there is just
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one piece of information you need.
>
>
Somewhere in the first quarter of all the data, you will find a section
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that starts each line with <AUX followed by some other characters.
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Amongst those lines you will find one that looks like the following:
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<aux:ApproximateFocusDistance>473/10</aux:ApproximateFocusDistance>
>
>
That's the one you want. Distance is expressed metrically. In this
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example, 473 divided by ten gives us a distance of 47.3 meters. Now,
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convert that to "'Melican money" meaning feet, or 153.72 feet camera to
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subject. (My example is taken from an image I shot in 2016 of an Osprey
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just lifting off from a tree limb.)
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>
One thing that I have not been able to determine is whether that
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distance is measured from sensor plane or from lens front element or
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whether it is a distance to first sharp focus point optically, which is
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implied by the terminology. This beats spending $$$ for a rangefinder!
>
>
Dave Grainger at birdsbydave.com
>
>
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>
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>
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>
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--
John Riegsecker