ZWO Darkening Ring Set for EFW & ASI461MM-P - DR-D90 petzval these eyepieces offer incredible value

these eyepieces offer incredible value in a very nice eyepiece

46 arcsecond Rayleigh Limit: 0

1") Focal Length 900 mm (35

The finely CNC machined aluminum body is both tough and sleek

Cassiopeia & Octans are etched into the reticle

ZWO Darkening Ring Set for EFW & ASI461MM-P - DR-D90 petzval these eyepieces offer incredible valueThe D90 Darkening Ring Set will help solve any possible light leak issue occurring in the gap between the filter wheel and the ASI461MM P. The set includes four (4) rings. Two have an external diameter of 90 mm and two have an external diameter of 106 mm. All four have an inside diameter of 72 mm and are about 0. 2mm thick. The 90 mm rings go between the 68 OAG and the EFW, and the 106 mm gets between the EFW and the ASI461. Here is how you install