About this product
Model: ak_owb-typ-3_clip_canon_eos_aps-c
Part Number: 8H00KA
The Astronomik OWB filter restores the original white balance of astro-modified DSLR cameras to enable them to be used for daytime photography as well.
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 astro-photography. Therefore the decision, which in former times had to be made, whether to 'victimise' 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 and disencumber your purse, too.
FEATURES
- Special spectrum in order to adapt modified DSLR cameras (removed or substituted inbuilt IR-filter) to achieve standard colour space in digital imaging.
- Optically polished substrate, striae-free and free of residual stresses
- Not sensitive to high humidity or ageing effects
- Scratch-resistance!
- Excellent quality substrate, diffraction limited - the optical performance of your telescope will not be reduced
- Parfocal with other Astronomik filters
- 1mm Glass Thickness
- Supplied in a high-quality, long lasting, filter box
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 made them unable 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 pretend to be the conventional built-in filter!
Transmission Chart
- The horizontal axis is the Wavelength in Nanometers (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous "H-Alpha" emission line of hydrogen.
- The transmission in % is plotted on the vertical axis.
- The blue line shows the transmission of the filter.
- The most important emission lines from nebulas are shown in orange. The most important lines are from ionised Hydrogen (H-alpha and H-beta) and double ionised oxygen (OIII).
The major emission lines of artificial light pollution:
| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm |
| Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |
The major emission lines of nebulas:
H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm
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.
- Parfocal with all Astronomik filters
- Thickness of 1mm
- Not sensitive to moisture, scratch resistant or ageing
- Optically polished substrate, striae-free and free of residual stresses
- Astronomik filters are delivered in a high-quality, long lasting, filter box
Customer reviews
| Average Rating (1 Review): | |
Natural colour balance from an astro-modified Canon Thursday, 30 January 2020 | Bryan
I had been using a Neodymium filter to revert my modified Canon M10 to daylight use. Substituting an OWB filter produces pictures with a much more natural colour balance - easily as good as the original . The clip-in mount is more positive than the clip-in MC filter I use for multispectral work. Expensive, but worth it.
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