The Optolong L-eNhance filter has been one of my favorite and most well-used filters to date, and the L-eXtreme promised to be even more effective at ignoring light pollution. (Click for larger version) Optolong L-eXtreme Filter Reviewįrom the moment I first heard the announcement of the Optolong L-eXtreme filter on Twitter, I was intrigued. The Eastern Veil Nebula captured using the Optolong L-eXtreme Filter. If you have tested the performance of this filter using a contrasting optical instrument (such as a camera lens or larger Schmidt-Cassegrain Telescope), please share your experiences in the comments! The telescopes were both apochromatic refractors with f-ratios of F/5.5, and F/7. I have tested the Optolong L-eXtreme filter using a one-shot-color dedicated astronomy camera (QHY268C), and a Mirrorless Canon EOS Ra. In this article, I will share my results using the Optolong L-eXtreme filter with 2 different color astrophotography cameras. The more selective bandpass transmissions are more suitable for fast optical systems, such as an F/2 RASA or Starizona Hyperstar configuration. Unlike the previous L-eNhance, the eXtreme does not include a bandpass for H-Beta (Hb). The Optolong L-eXtreme filter isolates the H-alpha (Ha), and Oxygen III (OIII) at 7nm exclusively. 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 is now being used in backyards across the globe, which is great news for those that take astrophotography images in heavy light pollution.
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