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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.
