Denkmeier - Denk Hi Def OIII Nebula Filters 2 inch format

The 'Square' Transmission Curves of our Denkmeier Hi Def Filters that are illustrated above mean that only the photons in the
desired emmission bandpasses of the observed object are contributing to the view. Therefore, red halos around stars will not be
present. A more natural and contrasty view is the result. Our Hi Def Filters are made to exacting standards through a coating
technology known as Ion Beam Sputtering (IBS). These filters are made on site at the Spectrum Thin Films Facility in NY with state
of the art coating chambers. Our filter glass is polished to better than Lambda/8 and coated with our best anti-reflective
dielectric material for less than 0.25% reflection. Note the amazing 98%+ transmission percentages illustrated in the light curve
profiles at the intended bandpasses of these filters.