PRODUCT DESCRIPTION
OPTOLON FILTER

THIS FILTER IS DESIGNED TO IMPROVE THE CONTRAST OF DEEP-SKY OBJECTS AND DIMUTE THE BRIGHTNESS OF THE BACKGROUND SKY, THANKS TO A SOPHISTICATED TRANSMISSION THAT LETS THROUGH THE LIGHT OF THE LINES IN WHICH DEEP-SKY OBJECTS SHINE (H-ALPHA, O-III , N-II, H-BETA, S-II…), BUT BLOCKS THE EMISSIONS OF HARMFUL LIGHT (FOR EXAMPLE THE HG LINE, OR THE WAVELENGTHS OF SODIUM VAPOR LIGHTS). ALSO, IT REDUCES THE BACKGROUND BRIGHTNESS CAUSED BY THE OXYGEN IN THE ATMOSPHERE (“SKY GLOW”). THE USE OF THIS FILTER IS RECOMMENDED IN AREAS WITH LIGHT POLLUTION AND IS SUITABLE FOR BOTH VISUAL AND PHOTOGRAPHIC USE.

COMPARED TO OTHER FILTERS FOR THE REDUCTION OF THE EFFECTS OF LIGHT POLLUTION, SUCH AS FOR EXAMPLE UHC OR CLS FILTERS, THIS IS A MULTIBAND PASS-THROUGH FILTER IT HAS ONLY A MINIMUM EFFECT ON THE COLOR RENDERING. THEREFORE IT IS SUITABLE FOR PHOTOGRAPHING OBJECTS THAT EMIT CONTINUOUS LIGHT: NOT ONLY EMISSION NEBULAUSES, BUT ALSO GALAXIES, STAR CLUSTERS, REFLECTION NEBULAUSES ETC. YOU CAN ACHIEVE UP TO 3X LONGER EXPOSURES THAN WITH UNFILTERED POSTURES.

TREATMENT CHARACTERISTICS:

THE TREATMENTS ARE NOT CEMENTED ON THE OPTICAL SUPPORT, BUT LAID BY EVAPORATION OF THE ELECTRON BEAM AND SUBSEQUENT DEPOSITION ASSISTED BY ION BEAM (IBAD PROCESS). THIS SPECIAL PROCESS ENABLES EXTREME DURABILITY AND SCRATCH RESISTANCE, ENSURES CENTER WAVELENGTH (CWL) STABILITY AND PREVENTS THERMAL DRIFT. FURTHERMORE, IT ALLOWES HIGH TRANSMISSION IN THE PASSBAND AND HIGH OPTICAL DENSITY IN THE BLOCKED FREQUENCY RANGE.

ATTENTION, THIS FILTER MUST NEVER BE USED ALONE FOR SUN OBSERVATION!