Lunático Astronomía

Baader Double Polarizing filter



Baader Double Polarizing

To screw into 1¼ or 2″ eyepieces/threads. The two filters can be rotated against each other to always be able to achieve comfortable brightness levels for moon observations, independent of the moon phase. The Baader Double Polarizing Filter can also be used for solar observations in combination with an objective sun filter from Astro Solar Film.

The double polarizing filters in 1¼ or 2″ can not be split into two parts, so you can’t take one half as a single filter e.g. for a Herschel wedge. The reason for this is more stability and quality: If both housings could be separated, they may move or be tilted to each other, which could harm the image quality and cause reflections.

Polarizer and neutral density filters need additional filtering (for example, Herschel Prism or Astro Solar Safety Film) before the eyepiece of the telescope for observations of the sun. Using without the appropriate filters can cause damage to these filters and eyesight.

Technical Data:

  • Baader Double Polarizing Filter – Perfect for observing moon or planets, or for solar observations with AstroSolar Safety Film ND 5.0.
  • For 1¼” eyepieces, is inserted into the standard filter thread. One part of the filter cell is rotatable so that you can adjust the brightness to the magnification of the eyepiece.
  • Both filters form a unit, to keep the filters perfectly aligned to each other – this double filter cannot be separated into single filters. This way, the filter delivers high-contrast views even at high magnifications. Polarizing filters offer the highest flexibility; if you are looking for superior image quality, you should use regular Neutral Density Filter, where there are fewer glass surfaces in the light path.
  • Please note: Polarizing filters (and all other eyepiece filters) may never be used without an appropriate solar filter (Astrosolar front filter, Herschel Wedge).
FILTER SIZE 1 25 inch 2 inch
MANUFACTURER Baader Planetarium Baader Planetarium
SKU (#) 2408340 2408344
EAN CODE 4047825012463 4047825022714
WEIGHT (KG) 0.042 0.078
TRANSMISSION RANGE Full Spectrum Full Spectrum
AR-COATING Phantom Coating® Group, planeoptically polished Phantom Coating® Group, planeoptically polished
FILTER USAGE Lunar, Planetary, Solar, Specialty Lunar, Planetary, Solar, Specialty
FILTER MOUNTED Double mounted (LPFC 6mm) – total height 15mm Double mounted (LPFC 6mm) – total height 15mm
TYPE OF FILTER Neutral Density, Polarizing Neutral Density, Polarizing
SINGLE OR SET? Single Filter Single Filter
FILTER SHAPE round round


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Filter thread

1,25", 2"

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