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Used in planetary observing.
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.
Vår expertkommentar:
Tyvärr har den här beskrivningen ännu inte översatts till svenska, så du hittar en engelsk artikelbeskrivning här.
Using colour filters for planetary observing requires practical experience and a large telescope aperture (the darker the filter, the more light the optics should let in). However, the orange filter can be used unrestrictedly by beginners. It brings out dark structures on Mars and increases contrast when viewing Venus at twilight. Alongside a Moon filter, an orange filter should always be readily available in your accessories bag.
(Stefan Taube)
