ZWO DARKENING RINGS D88 FOR EFW

The ZWO Darkening Rings D88 is a set of thin shims designed to prevent light leaks occurring in the gap between EFW filter wheels and ZWO imaging equipment.

The rings have an external diameter of 88mm, making them suitable for the EFW 5 x 2", 7 x 2", 7 x 36mm V1 & 7 x 36mm V2. With a thickness of less than 0.2mm, they do not add any significant backfocus distance for most setups. Four rings are included in total.