I have been using the C-Cup designed for the C100 on the FS5 and have found it superb compared to Sony's floppy one.
Its really sturdy, you can push yr eye into it so it offers a third point of contact. I highly recommend everyone gets one.
http://millerschneider.com/products/c-cup-for-the-canon-c100
Its really sturdy, you can push yr eye into it so it offers a third point of contact. I highly recommend everyone gets one.
http://millerschneider.com/products/c-cup-for-the-canon-c100