Sea&Sea Strobe Battery Box Outer Cap for YS Strobes (YS-D3 / YS-D2 / YS-01 / YS -03) @inonadmount The Lens Holder [hole] is

The Lens Holder [hole] is usable as like "M67 Lens Holder for Float Arm" as well

minimum focusing distance underwater will be shorten to "118mm/4

or subjects where the working distance makes it difficult to pull your external strobes or lights close enough for even lighting

The camera may be zoomed while the lens is attached and can focus up to a 30mm macro equivalent underwater

Sea&Sea Strobe Battery Box Outer Cap for YS Strobes (YS-D3 / YS-D2 / YS-01 / YS -03) @inonadmount The Lens Holder [hole] isSea&Sea strobe battery box outer cap for Sea&Sea YS D3, YS D2, YS D1, YS 01, YS 02, YS 03 and YS 110 strobes.