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I have the problem with 3 of 4 of my Zenphoto installations that they display not the correct shutterspeed.
I must say that my installs differ based on different server settings and PHP versions and it is not related to the pictures nor cameras as one of my installations displays the proper values.
I found this: https://forum.zenphoto.org/discussion/comment/1903785/#Comment_1903785 and I am not able to find this file /zp-core/exif.php in my installations.
Which file(s) do I need to look @?