Baader U-Venus-Filter (350nm)

Estimated shipping time 7 days

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.

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