UV/IRcut on KG3 - Infrared Blocking Filter

The Schott heat absorber filter glass KG3 permeable to UV radiation and blocked infrared radiation down 900nm due to absorption. I offer this filters with a additional dielectric UV/IRcut interference coating block up to 1200nm on the first surface.
The 2nd surface is AR coated to reduce reflections.
Filter bandpass is 390nm...680nm wavelength.
These filters are used in conjunction with an ERF filter in front of H-alpha systems or Herschel wedge to safe observe the sun.

The 20mm size (no cell) is recommend as replacement for the blue-green filter in the Lunt B600, B1200 and B1800 blocking filter modules if you want a brighter H-alpha image in the double-stack modus.

  • Schott glass KG3
  • T~90% @400nm - 600nm
  • T~75% @656.28nm
  • dielectric UV/IR coating to 1200nm
  • back surface AR coated
  • blocked UV and IR up to 5000nm
  • 1.25“ with thread M28.5 for 79.-EUR +add. shipping (in stock 0pcs)
  • 2“ with thread M48 for 119.-EUR +add. shipping (in stock 12pcs)
  • 20mm (no cell) for 79.-EUR +add. shipping (in stock 4pcs)