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Testing Optolong 3nm Ultra-Narrow band filters on North American Nebula and Pelican Finally, after months, I was able to test some of the new Optolong astronomy filters at 3nm not yet on the market (I'm a beta tester). This is a short test (only 3 hours) made under my sky bortle 9 and some veils. ... -
Optolong 3nm Narrowband Filters: Review by Molly Wakeling (AstronoMolly) I recently tested Optolong’s new 3nm hydrogen-alpha, oxygen-III, and sulfur-II filters and overall I am very satisfied, particularly for their price point ($439 each for 2”, $1239 for the kit). Until now, Optolong only offered 7nm-class filters (6.5nm for OIII and SII, 7nm for Ha), but for those who live under heavy light pollution and have well-guided mounts capable of 10-minute exposures, 3nm is... -
The Impressive Optolong L-eNhance Filter by AstroBackyard In this post, I’ll share my results using the Optolong L-eNhance filter for deep sky astrophotography in the city. The L-eNhance is a dual band pass filter that ignores artificial light, yet collects a strong signal emitted by certain nebulae.... -
Optolong L-Pro Filter Review (Astrophotography Camera Filter) Optolong L-Pro Filter Review (Astrophotography Camera Filter)... -
Optolong L-eXtreme Filter Review by AstroBackyard This review was tested by AstroBackyard. "The Optolong L-eXtreme filter is now being used in backyards across the globe, which is great news for those that take astrophotography images in heavy light pollution. This astrophotography filter features even narrower bandpasses than last year’s L-eNhance, making it perfect for nebula photography from the city. The Optolong L-eXtreme filter isolates ... -
Test Report -- Optolong L-eXtreme Filter Comparison by Jim Thompson, P.Eng The light pollution filter market continues to grow, with new offerings being released every couple of months. One of the latest filters to be released is the new L-eXtreme filter from the Chinese company Yulong Optics Co. Ltd. under their Optolong brand. I have a fair amount of experience with Optolong brand filters, all of which started in 2015 with a request directly from Optolong for me to tes...
