The Ghost of Morning by Dustin Abbott, on Flickr
Oh the Drama! by Dustin Abbott, on FlickrA good comparison with exception of missing mention of night photography. Here the Tamron has that extra stop of light transmission and has decent coma performance wide open. I’m not sure about the Canon’s coma performance, but it may not be used much for stars simply because of f/4 min aperture.stevelee said:comparison video with Canon 16-35 f/4:
https://www.youtube.com/watch?v=cmdqOD9zKnk