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various types of narrowband filters
Select the hole where the spring-loaded pin needs to be installed and put the pin in the hole
These tubes are designed to help adjust the distance between your camera and the telescope’s focal plane or accessories like correctors and field flatteners
The structure
Dark-Sky Filter 77mm Slim accessories various types of narrowband filtersUniversally 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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