Daystar Off Axis ERF 125mm with 460mm Cap - E-460F125 Drawtube Extension Tangent Inst BBox Encoder Sys

Tangent Inst BBox Encoder Sys (and compatible)

The Daystar Quark filters perform the best with F/4 - F/9 refractors

Comes with felt and three nylon screws

being only a little larger than your smartphone

Daystar Off Axis ERF 125mm with 460mm Cap - E-460F125 Drawtube Extension Tangent Inst BBox Encoder Sys125mm ERF Glass & 460mm Cap Off Axis For SCT Daystar Energy Rejection Filters (ERF) reduce the heat load on your filter and optics assembly by absorbing reflecting UltraViolet and or Infrared light while 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