Hi when I use older manual focus lenses with my Nikon D7000 the metadata (exif lens tag) shows '0.0 mm f/0.0 ', despite the fact that the camera saved the focal length correctly. How can I edit these tags to show the correct lens type? I set the Non-CPU lens data correctly in the camera and applied the profile for the shots, so it should show e.g. 105mm f/2.5. I would like to be able to correct that manually. I have tried exif edit but that doesn't appear to work. Any suggestions on how to do this would be much appreciated.
Lightroom doesn't provide direct support Exif editing. However, there are a couple of third party Lightroom plugins that should let you edit the lens data
Please note there is a bug in LR 2015.5/6.5 that doesn't show Nikon lens data correctly or at all. This could be what you are seeing and editing the EXIF won't help.