This is an Interfit SGM300 Flex Mount for the Nikon SB26,27,28 & Sony F56AM on-camera flash. It is an integral part of the Strobies series of flash light shapers.
There are several light shapers that work with the Flex Mount. A Snoot, Barndoor Set, Softbox, Honeycomb Grids, and Bounce Cards are available separately.
The Flex Mount is correctly fitted when your flash cannot be pushed any further inside it and is flush with the central hole.
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Comments about Interfit SGM300 Flex Mount for the Nikon SB26,27,28 & Sony F56AM:
I just received my SGM300, actually 2 of them, along with the Strobies kit. My excitement over seeing what I could do with what looks like a very cool idea quickly turned to disappointment when I discovered the SGM300 Flex Mount does not fit the SB26. [...] I'm going to attempt some surgery on the mount with an exacto knife to see if I can make it fit.
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