Daystar ERF 150mm with 200mm Cap - E-200N150 Accessories_Interference Eliminators but it will be around

but it will be around 5Å

(diagonal mirror and eyepiece optional)

You are getting an excellent Focal Extender if it adds some real versatility to your telescope accessory line-up

Quark and camera not included

It easily attaches to your telescope's tripod or mount with a Velcro belt

Daystar ERF 150mm with 200mm Cap - E-200N150 Accessories_Interference Eliminators but it will be around150mm ERF Glass, Cell & 200mm ID Cap For Refractors 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 light