TSN-EC2 eyepiece conversion ring

TSN-EC2 eyepiece conversion ring

Required when using a previous model TSN-820/820M series eyepiece with a TSN-880/770 series.

When other model eyepieces are used with TSN-880/770 Series scopes, not only will the specifications including the
magnification change, but there may be cases where an adequate optical performance cannot be obtained.