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Top news results for astrophotography filters
Optolong L2 Filters Tested: The April 2026 ScopeTrader Issue
Monday, April 6, 2026 by Richard Harris
Welcome to April, where galaxies are in full bloom. Here in Missouri the skies are finally starting to settle into something usable. If the pattern holds like it usually does, we tend to get our most stable stretch somewhere between April 10th and the end of the month. Those are the nights where ...
Why luminance frames miss narrowband nebula details
Monday, October 13, 2025 by Richard Harris
So you've spend a clear night capturing the Orion Nebula with your monochrome astrophotography camera. You shot one image through a luminance filter (essentially capturing all visible light), and another through a special Hydrogen-alpha (Hα) narrowband filter. When...
Why filters look colored
Friday, July 18, 2025 by Richard Harris
Imagine you're holding a deep red filter from your telescope’s filter wheel up to a bright light. The glass looks red, and everything you see through it is tinted in that hue. If that filter’s job is to pass only red light from the stars, you might wonder: Why is the filter itself re...
Astrophotography filters: How narrow is too narrow
Saturday, June 29, 2024 by Jim Thompson
For many years now I have been promoting the idea that for emission nebulae, whether you have light pollution (LP) or not, the narrower your filter’s pass bands are, the better. Time and again my test results have demonstrated this relationship to be true; that object contrast and signal-to-no...