Dark-Sky Filter 77mm Slim nefa More contrast and details for

More contrast and details for all urban observers and astrophotographers

making it a reliable option for both planetary observation and detailed views of smaller deep sky objects

Blocks yellow light

it allows you to increase the magnification of any eyepiece with the same barrel size that you already own

This design also helps maintain comfortable eye relief and preserves image quality across the field

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