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h alpha longpass filter on 2" / 48mm ad for telescope astrophotography / imaging For Sale


h alpha longpass filter on 2



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h alpha longpass filter on 2" / 48mm ad for telescope astrophotography / imaging:
$45

THIS IS NOT A VISUAL FILTER!!!BEST FOR LONG EXPOSURES OF BRIGHT NEBULAE!
The Orion Nebula was shot with a stock Canon T3i from a white zone (high light pollution) - 6 minutes exposureThe Horsehead Nebula from a yellow zone (some light pollution) with a modified Canon T3i -3 minutes exposureThe Rosette Nebula from the same yellow zone (some light pollution) with a modified Canon T3i - 4 minutes exposure
TELESCOPES USED: ASTRO TECH 150MM NEWTONIAN IMAGER AND WILLIAM OPTICS ZENITHSTAR 71 DOUBLET REFRACTOR.
CAMERA , T-RING AND PRIME FOCUS ADAPTER NOT INCLUDED! GOOD FOR LONG EXPOSURES OF BRIGHT NEBULAE!
WARNING: For NIGHT USE only! NOT for viewing or photographing the sun!
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