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Astronomik
Astronomik OIII 6nm CCD Filter
$330.00
Astronomik · Made in Germany
OIII 6nm.
Nothing gets through
but oxygen.
A 6 nm passband centred on both doubly-ionised oxygen lines at 496 nm and 501 nm, with up to 92% transmission at the peak. Everything else, from city glow and sodium to LED and infrared, is blocked to ~1150 nm.
6 nm
FWHM passband
Half the bandwidth of the 12 nm
92%
typical transmission
At the major OIII line (501 nm)
1 mm
glass thickness
Parfocal with all Astronomik filters
~1150 nm
IR blocking depth
Full UV-to-IR suppression outside passband
Transmission curve
A 6 nm window. Precisely where it matters.
The curve below shows the actual Astronomik OIII 6 nm passband. Both doubly-ionised oxygen lines at 496 nm and 501 nm sit inside the passband. Everything else, including H-beta at 486 nm, is blocked.
Technical specifications.
Optical
Target emission lines
OIII at 496 nm and 501 nm (doubly-ionised oxygen)
Full Width at Half Maximum (FWHM)
6 nm
Typical transmission (501 nm)
92%
Guaranteed minimum transmission (501 nm)
>88%
IR blocking cutoff
~1150 nm (full UV-to-IR blocking outside passband)
Physical
Glass thickness
1 mm
Glass quality
Finely polished; free of striae, residual stresses and bubbles
Parfocal
Yes, parfocal with all other Astronomik filters
Diffraction-limited
Yes
Coating
MFR coating focal ratio range
f/4 to f/15
MaxFR coating focal ratio range
f/2.2 to f/6 (full spec); ~90% transmission at f/2
Scratch resistance
Extremely scratch-resistant and durable
Environmental resistance
Completely resistant to high humidity and ageing effects
Quality Assurance
Individual measurement
Every filter measured on a high-end PerkinElmer Spectrophotometer
Filter data label
Actual passband data printed on every individual filter box
Country of manufacture
Germany
Delivery
High-quality, long-lasting Astronomik filter box
Suitability
Recommended camera type
CMOS astro cameras with low dark current; modern mirrorless (Sony alpha 7, Canon EOS R, Nikon Z); CCD cameras
Visual observation
Suitable (dark and urban skies)
Not recommended for
Planetary/webcam video (OIII is not a planetary filter)
Precision-made in Germany. Backed by Bintel.
Australian warranty
Full local cover
Ships from Sydney
From local stock
Expert advice
From working astronomers
40+ years
In Australian astronomy
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Astronomik · Made in Germany
OIII 6nm.
Nothing gets through
but oxygen.
A 6 nm passband centred on both doubly-ionised oxygen lines at 496 nm and 501 nm, with up to 92% transmission at the peak. Everything else, from city glow and sodium to LED and infrared, is blocked to ~1150 nm.
6 nm
FWHM passband
Half the bandwidth of the 12 nm
92%
typical transmission
At the major OIII line (501 nm)
1 mm
glass thickness
Parfocal with all Astronomik filters
~1150 nm
IR blocking depth
Full UV-to-IR suppression outside passband
Transmission curve
A 6 nm window. Precisely where it matters.
The curve below shows the actual Astronomik OIII 6 nm passband. Both doubly-ionised oxygen lines at 496 nm and 501 nm sit inside the passband. Everything else, including H-beta at 486 nm, is blocked.
Technical specifications.
Optical
Target emission lines
OIII at 496 nm and 501 nm (doubly-ionised oxygen)
Full Width at Half Maximum (FWHM)
6 nm
Typical transmission (501 nm)
92%
Guaranteed minimum transmission (501 nm)
>88%
IR blocking cutoff
~1150 nm (full UV-to-IR blocking outside passband)
Physical
Glass thickness
1 mm
Glass quality
Finely polished; free of striae, residual stresses and bubbles
Parfocal
Yes, parfocal with all other Astronomik filters
Diffraction-limited
Yes
Coating
MFR coating focal ratio range
f/4 to f/15
MaxFR coating focal ratio range
f/2.2 to f/6 (full spec); ~90% transmission at f/2
Scratch resistance
Extremely scratch-resistant and durable
Environmental resistance
Completely resistant to high humidity and ageing effects
Quality Assurance
Individual measurement
Every filter measured on a high-end PerkinElmer Spectrophotometer
Filter data label
Actual passband data printed on every individual filter box
Country of manufacture
Germany
Delivery
High-quality, long-lasting Astronomik filter box
Suitability
Recommended camera type
CMOS astro cameras with low dark current; modern mirrorless (Sony alpha 7, Canon EOS R, Nikon Z); CCD cameras
Visual observation
Suitable (dark and urban skies)
Not recommended for
Planetary/webcam video (OIII is not a planetary filter)
Precision-made in Germany. Backed by Bintel.
Australian warranty
Full local cover
Ships from Sydney
From local stock
Expert advice
From working astronomers
40+ years
In Australian astronomy
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