ZWO New EOS Lens Adapter for EFW

The Short EOS adapter for EFW&Cooled camera(6.5mm back-focus version).

Extend distance: 17.5mm

This new type is unadjustable. EOS-EFW supports Canon EF lens only, and cannot work with EF-S lens.So you can use Canon Lens with ASI1600 and EFW