Denkmeier - Denk Hi Def Dual Band Planetary Filters

• Format: 1.25 inch


• Cell: 1.25" Threaded Machined Anodized cell


• Material: High Quality Grade A BK7


• Wave Front: Lamda/8 Ultra low distortion


• Polish: Precision Polished Ultra-Smooth Optical Surfaces


• Surface Quality: Scratch/Dig 40/20 Beveled on All Edges


• Coatings: Coated on both sides to Block UV to 460nm(Blue) and 530nm(yellow)


• Spectral Properties: Transmission occurs at 490-530nm and 590- 700nm


• Filter Coatings: Ion Beam Deposited, Multi Layer Dielectric


• Hardness: Very Hard and Durable for worry free cleaning

This All Dielectric coated filter is a very unique contrast enhancement filter. See brighter Greens and Reds. This enhancement filter will greatly improve the contrast of Mars, Jupiter and Saturn.

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.