Adorama 55mm to T-mount Adapter: for Mounting 55mm Threaded Digital Cameras on a Telescope, Spotting Scope or Nightvision Scope.
Price 24.95 USD
This is a 55mm thread to a T-mount (42mm) thread adapter. It allows all 55mm threaded cameras to be used with telescope and spotting scopes, through the use of a scope T-adapter. Most scope to T-adapters are available through the scope manufacturer.