Astronomik Original White Balance OWB-CCD Type 3 Filter

The OWB filter would usually not be designated as an "astronomical" filter. The intention is to enable converted DSLR cameras (without inbuilt IR-filter) to be used for 'terrestrial' photography again.

The OWB (Original White Balance) filter shifts the complete spectrum of a converted DSLR in such a manner that the camera will not be exclusively usable for astrophotography. Therefore the decision whether to permanently alter a DSLR in order to exclusively use it for astronomical tasks or accept the lower sensitivity on the red end of the spectrum it is now a thing of the past.

The OWB filter is available as a Clip-Filter for cameras used for astrophotography.

Main use

DSLR cameras which have been converted for astronomical use by removing the inbuilt IR-filter or by substituting it with a filter with greater range for H-alpha, have a white balance that make them unusable for 'terrestrial' purpose. The spectral sensitivity of the DSLR will be changed by an OWB-Filter to the former range. In other words, the OWB pretends to be the conventional built-in filter!

Suitability

• Visual observation (dark skies): Unsuitable
• Visual observation (urban skies): Unsuitable
• Film photography: Unsuitable
• CCD photography: Unsuitable
• DSLR photography (original): Unsuitable
• DSLR photography (astro modified): Very good, achieves a standard white balance for 'terrestrial' photography
• DSLR photography (MC modified): Very good, achieves a standard white balance for 'terrestrial' photography
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Unsuitable

Technical Data

• Special spectrum in order to adapt modified DSLR cameras (removed or substituted inbuilt IR-filter) to achieve standard colour space in digital imaging.
• Par focal with other Astronomik filters
• Glass thickness: 1mm
• Completely resistant against high humidity, scratches and aging effects
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Astronomik filters are delivered in a high-quality, long lasting, filter box