Hi
This is a replacement cover for the SBIG Series cameras (either direct to the camera or to the CFW) and is configured to accept any Olympus lens or a lens with an Olympus mount (e.g Tamron) for those ultimate widefield shots of the Milky Way.
Description is here.
http://ca.geocities.com/bradydjohnso.../widefield.htm
$190AUD ono
cheers
Martin