Advanced Search Question: How to search for images that are missing specific EXIF informations?

[uti.devel]

Hello,

I recently came across DigiKam while searching for an open-source 
alternative for managing my photos. DigiKam appears to be a very 
promising replacement, offering the ability to organize my photos within 
a folder structure of my preference and providing all the benefits of a 
managed gallery.

However, I've encountered a small hurdle that I can't seem to overcome. 
I'm having trouble utilizing the Advanced Search feature to find images 
that are missing certain information in their EXIF data, such as ISO or 
camera/lens details. Even when I attempt to select all models or a wide 
ISO range and choose "none of these conditions are met" I'm unable to 
retrieve any results.

Could you kindly guide me on how to search for images that are missing 
specific EXIF information?

Thank you for your assistance.
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