My copy front focused. Sent it back, bought the Tamron version. Bit more CA and an absolute bitch to find filters for.
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....... I had too much light pollution from Margaret River (WA) Town nearby.
For visual use it may work with your C6 but you might want to consider something better suited for your application. AP is definitely out of the question. What is the weight of the largest EP you will be using with the C6?