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Your cart is empty.Introduction： It's about a 3nn dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae's emissions into H-Alpha (red) and Olll (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OllI (496nm and 500nm) and H-alpha (656nm). Used with DSL, color/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.
LiZhao
Reviewed in the United States on May 1, 2024
This filter won’t work on fast lens, unless close the aperture to f4 or more. At f2.8 totally unusable
David Dahlke
Reviewed in the United States on December 12, 2024
Will
Reviewed in the United States on November 26, 2024
No star halos like I used to get with the L-eXtreme. Much happier with this one.
Anne
Reviewed in the United States on February 22, 2023
I upgraded to the ultimate from the extreme filter. Using an esprit 100 with 2600mc. This filter like the extreme is amazing for pulling more details from the light polluted sky's around me. I upgraded because I was getting a few too many star halos with the extreme. With the ultimate this issue has been drastically reduced. It still has random halos, but nothing like before. Expensive but worth the price for what it allows you to see.
Daniel Bahlman / Spectre Imaging
Reviewed in the United States on November 3, 2022
Unfortunately this filter will still produce halos on some stars but not as bad as most others and the contrast helps to produce images nearing monochrome with a good cooled OSC making it absolutely worth it. I own all Optolong Filters and was expecting a harder time with focus on this one with only 3 nm bandpass but had no issues focusing or acquiring targets as anything with Ha or Oiii pops very nicely with a 10 second test shot on 294MC with Redcat51. I do this all manually with a Skyguider Pro and had no issues.
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