Before using m43 I was photographing with Nikon DSLRs. One of the cool Nikon features I'm missing is the menu option to add "non CPU lens data" to exifs. I'm shooting with a OM-D EM-5 and I'm currently tagging my files using lenstagger (a Lightroom plugin) and exiftools. My current workflow is like that: Import RAWs into Lightroom, search for RAWs without lens data, mark them, run the lenstagger command tagging them with "Voigtländer 25mm" (in my case). "Problem" is that I've just ordered a Voigtländer 17.5mm so that this workflow won't make sense any longer. So I've thought about some way to automatically tag the files using some kind of identifier. The idea is using the "lens focal length setting" from the IBIS menu. This data is stored in the "Makernotes" under "ImageStabilisation" at byte position 7 (according to a very helpful post in a German forum from user rodinal). Is somebody using that approach? What are you doing to get your lens data into exifs using adapted/non-CPU lenses?