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Tristan Romain Renaud

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Can you trust (maybe just a little bit) the focus distance recorded in the EXIF metadata?

/ Photography, Test / By Tristan Romain

Why do we care?

In theory, lenses send the focus distance information to the camera. It is recorded as an EXIF metadata in the file. Using it can have different advantages if you are interested in the distance at which the photo is supposed to be in focus.

Short answer

You need to try with you own gear, but it is very unlikely that you can trust, even just a little bit, the information provided about the focus distance.

Long answer

This is well known fact. In many forum, people often report you can’t trust this distance information. But it is good to be sure. So, I did some tests with the following gears: Nikon D750, Nikon Z50, and different lenses (20 mm f/1.8G, 70-200 f/2.8 II,  …). All came to the same conclusion: the distance recorded is really not accurate. How much inaccurate ? Let me give you the results:

Example 1

In reality, the image is at infinity focus, not 1.3 meters like written into the EXIF metadata…

Example 2

This one was pretty accurate, to be fair.

With a Nikon Z50, you just don’t have the focus distance recorded. Same issue with some mirrorless cameras like Panasonic LX100 or Fuji X100S.

I have also tried with different Canon bodies, but same problem: not too bad at very close distance, but totally irrelevant as soon as the distance focus is above a couple of meters.

Conclusion

Make your own tests with your gear, but don’t expect much.

There is some hope if what matters is distance of images with a focus distance below a few meters. But beyond this, I would find a different way to achieve the goal, whatever it may be as the focus distance information is irrelevant, when it exists.

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    Flickr Photos

    Swimming with swans
    All is quiet on Geneva's lake
    Any given freezing winter morning in Geneva
    Geneva's lake on a windy day
    Storm in Geneva
    A road to the sea
    Flying terns
    Western Europe
    Geneva's light house
    A quiet morning in Geneva
    A dry summer in Switzerland
    Spring above Geneva
    Sahara on glacier
    Two restrooms with a view
    Baltschiedertal
    Walking on a glacier
    Winter in Cannes
    The price of fame

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    500px AI android APS-C automation camera Camera Futura canon Canon S100 cloud compact compact camera Culling digital photograpy DSLR facebook flickr Full frame Futura Photo google+ instagram lightroom mirrorless nikon Nikon D7000 performances camera photo culling photography photosharing photo sharing picasa pictarine post-process pre-process RAW samsung smartphone Smugmug Software sony technology test test camera Time lapse workflow
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