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More contrast and details for all urban observers and astrophotographers
Blocks yellow light
Its 72 degree apparent field of view creates a wide and immersive viewing experience that helps keep objects in view longer while maintaining a natural sense of scale
this filter can also be used without restriction in front of a wide-angle lens
Dark-Sky Filter 77mm Slim nefa More contrast and details forUniversally applicable dark sky filter with 77mm filter thread for photo lenses. Particularly suitable for increasing contrast in aurora and deep sky photography. The wavelengths of 550nm (green) and 630nm (red), which are particularly relevant for aurora photography, are transmitted to more than 90%. A special feature of other so called CLS filters is that only the yellow light of the sodium line is effectively blocked at 590nmwill. This effectively
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