In addition to air unrest, brightening the night sky is the biggest obstacle to observing faint objects beyond the solar system. Due to street lamps and other artificial lighting, the sky in human settlements is no longer really black. This also affects the contrast and thus the perception of the deep sky objects. Depending on the type of celestial object, however, you can filter away some of the disturbing light and thus facilitate the observation of the objects.
The Explore Scientific O-III filter uses the properties of the so-called emission mist. These objects glow in certain colours, the so-called emission lines. The emission lines are linked to certain chemical elements - in this case oxygen. The EXPLORE SCIENTIFIC O-III fog filter blocks all other colours (and thus almost all artificial light) and allows only the two emission lines of oxygen to pass through. The effect is amazing: suddenly fog becomes visible in places that appear completely empty without a filter. For example, in slightly brightened skies, the cirrus nebula NGC 6992 is practically invisible with a 200 mm telescope. When using this filter, you can see the mist and its structures completely without problems. A must have for any visual amateur astronomer and also for astrophotography.
The EXPLORE SCIENTIFIC fog filters come with an individual test report - so you can be sure to receive high-quality filters.
The narrow passage range of this filter of only 6.5 nm bandwidth, works out the dim luminous emission fog even under difficult city conditions or makes them visible.
Features:
- Facilitates the observation of so-called emission nebula.
- Blocks almost the total...