Filtre Filtru rosu #25 2"

Blue and blue-green light is blocked. Contrast between dark and lighter zones increases dramatically. This is very helpful when observing Jupiter and Saturn. On Mars, for observing the polar caps.

Further properties:

• Manufactured from high-quality optical glass
• Filter surface is plane parallel, polished and anti-glare coated
• Double-sided filter threads (internal/external): Multiple filters can be used simultaneously

The filter comes in a practical dust-proof case.