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Dark sky astronomy locations guide
Friday, May 23, 2025 by Richard Harris
Finding a dark sky location for astronomy begins with understanding what makes a sky dark. A dark sky is one where artificial light is minimal or absent, allowing celestial objects to appear with clarity and contrast. This level of darkness isn’t judged by personal perception but by measured v...
Large telescopes vs light pollution
Sunday, March 16, 2025 by Richard Harris
For amateur astronomers, bigger telescopes mean better views—plain and simple. While professional observatories have massive 10-meter mirrors, most of us are working with something in the 8" to 24" range, with some die-hard enthusiasts pushing up to 30" for visual observing. A 1...
Optolong L-Para filter
Thursday, January 16, 2025 by Richard Harris
Optolong has introduced the L-Para (L-Parallels), a dual narrowband 10nm light pollution filter tailored to meet the demanding requirements of astrophotographers. With a full width at half maximum (FWHM) of 10nm for the OIII (500.7nm) and H-Alpha (656.3nm) emission lines, the filter achieves a trans...
The Bortle dark-sky scale explained
Friday, September 13, 2024 by Richard Harris
The Bortle Dark-Sky Scale, named after its creator John E. Bortle, is a nine-level numeric scale that measures the night sky's brightness and the visibility of celestial objects. Bortle, an experienced amateur astronomer, introduced this scale in 2001 to help fellow stargazers quantify the quali...