Hi guys, now I have decided to rent a Sigma 50-500mm f/4.5-6.3 and the Canon 1.4x III for shooting the upcoming full moon. Would the Canon 1.4x teleconverter work with that Sigma lens? And with the teleconverter (thus lose some light), will I still be able to get decent shutter speed and low ISO while shooting the full moon. I am not quite sure since I have never used a teleconverter before, and also that I don't know how much light a full moon gives.
Thanks in advance!