I found reading in product descriptions about ERF coatings of this diagonal, would that suffice for use under a quark in a 130apo?
Baader 2" Clicklock Mirror Star Diagonal # CLDIAG-2 295610
Oversized 2 "dielectric lamda / 10 levels with 112mm optical length
Mirror repels UV and IR radiation, provides high security at the solar observation in white light and with Ha-sun filters
Scratch-resistant, hard-coated mirror surface for safe cleaning, scratch-resistant even in extreme conditions
Baader 2" ClickLock clamp for ultrafast clamping action
Removable 2" Safety Kerf nosepiece
Edited by SloMoe, 15 August 2020 - 10:50 AM.