In Lightroom 5, I believe that aperture larger than F1.0 is reported incorrectly.

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  • Updated 4 years ago
If you have a lens that has an aperture larger than F1.0, the Lightroom 5 cannot report it correctly, at least in the "Library Filter", it wouldn't show F0.95, but instead "Unknown Aperture".
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Kolen Cheung

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Posted 5 years ago

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Sidath Senanayake

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I recently got myself a Leica lens that goes down to f/0.95 and when shooting wide open I can't get the built in Lightroom profiles for vignetting to work because of this problem.

Please fix as soon as is reasonable.
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Sidath Senanayake

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Looking further into this, this may be a limitation of Exif SubIFD. The aperture value is stored as a power of sqrt(2) and is an unsigned number. This means that it is impossible to store aperture values lower than 1 since that would require a negative number to be stored.

Despite this, it would be useful to have Lightroom work around this (surprising) shortcoming of Exif to work with the increasing number of f/0.95 (and faster) lenses.