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This is NOT a visual filter!
BEST FOR LONG EXPOSURE ASTROPHOTOGRAPHY OF BRIGHT NEBULAE
The Orion Nebula was shot with a stock Canon T3i from a white zone (high light pollution) -  6 minutes exposurewith the 2" version of this filter!
The Horsehead Nebula from a yellow zone (some light pollution) with a modified Canon T3i - 3 minutes exposure with the 2" version of this filter!
The Rosette Nebula from the same yellow zone (some light pollution) with a modified Canon T3i - 4 minutes exposure with the 2" version of this filter!
TELESCOPES USED: ASTRO TECH 150MM NEWTONIAN IMAGER  AND WILLIAM OPTICS ZENITHSTAR 71 DOUBLET REFRACTOR
WARNING:  FOR NIGHT USE ONLY!   NOT for viewing or photographing the sun!!!!!!

Filed under: Eyepieces & Accessories