One of the nice things about digital photos is the metadata carried with each photo. It includes a bunch of stuff you may choose to add, like keywords, location, captions, etc. It also includes some stuff usually added automatically by the camera, like camera make and model, serial number, date and time, exposure, flash info, etc. All of this stuff is really useful, because it allows you to organize and search your photos in different ways ("Show me all the pix of Frankie and Johnny together, taken with my Nex-6", or "all photos of baseball"). The camera also generally automatically adds lens info, like make and model, f-stop, actual focal length (lens is 10-18 zoom, this photo was shot at 15mm.). Unfortunately, in the case of an adapted lens or a manual lens like the Rokinon 8mm, the camera doesn't do that, because it doesn't have the info. It doesn't know what the lens is, so it can't put it in the metadata. Now, this doesn't matter to the photograph, since the metadata has absolutely no effect on how the photo is processed, printed, etc. But, personally, I really like having all the metadata there, both for searching ("show me all my photos with the Rokinon fisheye") and because, when I publish on-line, I like having this data carried to the jpg so a knowledgable viewer can see it if they want. There's a great tool for doing this in Lightroom. It's a plugin called lenstagger LensTagger Lightroom plugin, and it works great. You do need to take an extra step, by selecting the photos taken with a lens and telling lenstagger to do its thing on them. I do this when I import, because I always tag and keyword my photos then anyway, so it's very little extra work. The instruction on the lenstagger website are clear, so I won't repeat them here. lenstagger makes use of a really wonderful open source tool called ExifTool ExifTool by Phil Harvey. ExifTool can do absolutely anything to your metadata, and much more as well, but it's a very powerful command line tool that requires some learning. lenstagger makes it almost automatic, for this one specific purpose. I have no connection with lenstagger other than as a happy user, but decided to post this just as useful info to all those using adapted and manual lenses with the Nex.