Lunático Astronomía

Baader U-Venus-Filter (350nm)

210,00295,00

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Baader U-Filter (Venus and UV) 1¼” and 2″

Baader U-Filter with a Transmission peak approx 80% at CWL 350nm, bandwidth 60nm (320-380nm), with complete blocking of the spectral range from 200nm to 1120nm. Dielectric multi-coated coating on optically polished Schott glass UG-11. Enables shooting in the deep UV spectral region; a wavelength range that was previously inaccessible for amateur astronomers. The Solar Calcium K-Line also is within the passband of this filter.

IMPORTANT NOTE:

The Baader U-Filter was created for imaging Venus with a webcam, CCD and CMOS cameras. Using the filter for visual observations is impossible due to the eye’s insensitivity to this spectral range (UV).

Venus Sickle – 2/3 closed, a rare photo © M. Rietze. Venus Recording © W. Paech.

Requirements for Successful use of this Filter

  • UV sensitive imaging camera such as the SKYRIS 274M with at least a telescope of 5″ diameter. A telescope with 8″ diameter is recommended.
  • Single Shot CCD is not suitable for use with the U-Filter.

 

Transmission curve

Technical Data:

  • Transmission peak approx. 80% at 350nm, bandwidth 60nm (320-380nm), completely blocking the entire spectral range from 200nm to 1120nm.
  • Dielectric multi-coating on optically polished Schott Glass.
  • Enables imaging in the deep UV spectral region. A “breakthrough” for imaging the planet Venus! Allows amateur astronomers to capture cloud structures of the Venusian atmosphere.
  • Successful astro-application of this filter requires a suitable UV-sensitive lucky imaging camera module (i.e. SKYRIS 274M) with at least a telescope of 5″ diameter (a telescope with an 8″ diameter is recommended).
  • Non-astronomical applications possible: e.g. check for paint damage on cars or state of health of plants and much more.
FILTER SIZE 1 25 inch 2 inch
MANUFACTURER Baader Planetarium Baader Planetarium
SKU (#) 2458292 2458291
EAN CODE 4047825022240 4047825009838
WEIGHT (KG) 0.058 0.061
TRANSMISSION RANGE UV UV
FILTER THICKNESS (WITHOUT CELL) 2 mm 2 mm
HBW (HALFBANDWIDTH) 60nm 60nm
CWL (CENTRAL WAVELENGTH) 350 nm 350 nm
AR-COATING dielectrically coated, planeoptically polished dielectrically coated, planeoptically polished
FILTER USAGE Specialty, UV-Pass Specialty, UV-Pass
FILTER MOUNTED Mounted (LPFC 6mm) Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband Narrowband
SINGLE OR SET? Single Filter Single Filter
FILTER SHAPE round round

 


If you any doubt, contact us at info@lunatico.es.

 

 

 

Filter thread

1,25", 2"

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