#38 Light Blue 2''
The color filters are to be used when watching the moon and planets
The #38 (17%) light blue filter blocks almost all light rays in orange and yellow and is therefore predestined for observation and recognition of the strips, as well as the large red spot on the surface of Jupiter. In particular it helps to observe dust storms on the planet Mars.
Used in large aperture telescopes larger than 12 inches, Venus atmosphere structures can be recognized.