These double polarising filters can be rotated against each other to always be able to achieve comfortable brightness level for moon observations, independent of moon phase. The Baader Double Polarising Filter can also be used for solar observations in combination with an objective sun filter from Astro Solar Film.
The double polarising filters can not be split into two individual single unit polarising filter components – both filters form a single unit. The reason for this is to keep the filters perfectly aligned to each other, since if both filter housings could be separated, the filters may be tilted to each other, which would result in a degraded image quality and cause reflections.
IMPORTANT INFORMATION FOR OBSERVING THE SUN
Polarising and neutral density filters need additional filtering (for example, with a Herschel Prism or Astro Solar Safety Film) for observations of the sun. Using these without the appropriate additional safety equipment can cause damage to the these filters and your eyesight.
|SKU (#)||2408340 (1.25″) / 2408344 (2″)|
|TRANSMISSION RANGE||full Spectrum|
|FILTER THICKNESS (WITHOUT CELL)||2 mm|
|AR-COATING||Phantom Coating® Group, planeoptically polished|
|SPECIAL FEATURES||double polarizing filter for stepless brightness adjustment|
|FILTER SIZE||1.25″ & 2 “|
|FILTER USAGE||Lunar, Planetary, Solar, Speciality|
|FILTER MOUNTED||Double mounted (LPFC 6mm) – total height 15mm|
|TYPE OF FILTER||Neutral Density, Polarising|
|SINGLE OR SET?||Single Filter|