Will someone please let me know how to create a lens profile for the Nikon 14mm f/2.8? I bought this lens used, but there isn't a lens profile available in LR5 or Photoshop CC. Is there someway to add a lens profile if one is available somewhere online? If not, how do I adjust the parameters for this specific lens? It's really wide so there is quite a bit of distortion and vignetting. Thanks for any info. 
