Daystar ERF 75mm with 100mm Cap - E-100N75 Accessories This achromatic doublet refractor utilizes

This achromatic doublet refractor utilizes Daystar’s Quark solar filter system for research-grade chromosphere viewing

or anyone looking to get their start observing solar activity

Eyepiece Holder for Quark

Full 22mm Clear Aperture

For use on F/7 or longer focal ratio refractors

Daystar ERF 75mm with 100mm Cap - E-100N75 Accessories This achromatic doublet refractor utilizes75mm ERF Glass, Cell & 100mm ID Cap For Refractors DISCONTINUED DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and or I light and transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum. The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for