ZWO New EOS Lens Adapter for EFW

The Short EOS adapter for EFW & Cooled camera(6.5mm backfocus version).

Extend distance: 17.5mm

This new type is unadjustable. EOS-EFW support Canon EF lens only, cannot work with EF-S lens.

So you can use Canon Lens with ASI1600 and EFW