The EF 180mm f3.5L macro is the least used lens I have. I should just as well get rid of it and probably would not miss it, but I know full well I will regret it as soon as I do that. It's quite a bit better than the Sigma 180mm f3.5 I once had, in terms of build and optics. Each time I use it, I am not disappointed. The long working distance is perfect for shooting critters that might move if they sense you are too close. The colour and sharpness are outstanding qualities this lens has, not to mention how well it's built. Unfortunately, this lens does not work well with the Commlite AF adapter.
Unlike the EF 100mm f2.8L Macro, which is a complete disaster on the Commlite adapter, the 180L does work, just not the way you expect it to. I set the shooting mode to Aperture priority 99% of the time, except when the light is getting low, I would switch to Shutter Speed Priority. When this lens is mounted on the A7 with the Commlite adapter, the shooting mode does not seem to have an effect, whether set to A or S. The adapter seems to have a mind of its own and changes the aperture/shutter speed as it saw fit, like the mode dial is on P. The strange thing is that when the adapter sets the aperture on f4.5, it does not close down when the shutter is pressed, but stayed wide open. It does, however, support Full Time Manual focus, which is important for macro shooting, and I was able to take some pictures with the lens.
Auto focus wise, let's just say forget about it. The 180L macro lens already has a very long focus travel distance and the adapter would rack the lens from closes to infinity each time it fails the attempted focus. It's excruciating to watch the lens struggle. By the time it finally obtained focus, the cows had already come home. So, this lens is best used in manual focus mode, and AF is pretty much useless anyway when shooting macro near maximum magnification. Still, it's useful because manual focus is possible.
All pictures below were taken with the Commlite AF adapter on Sony A7 with Canon EF 180mm f3.5.