Svbony SV160 SII Filter 1,25 7 nm Narrow-Band for CCDs (SKU: W9122A) all astro filters opinie

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SVBONY S-II 1.25" SV160 7 nm is a professional astrophotographic filter with a half-transmittance window width (FWHM) of 7 nm. It transmits light with wavelengths of 671.6 nm and 672.4 nm characteristic of ionized sulfur atoms, the recording of which is particularly important when photographing emission nebulae.

This filter combines the ability to almost completely eliminate the unwanted component coming from sodium and mercury lamps with high transmittance for the S-II spectral line, one of the most important from the point of view of astrophotography . It was made on a high-quality optical glass substrate, additionally secured with a multi-layer coating applied in the process of ion-assisted deposition. Thanks to this technology, the obtained coating effectively stabilizes the position of the maximum permeability band, and also has a protective function due to increased resistance to scratches.

Attention! The S-II filter is not recommended for visual observation or solar observation.

The most important features of the SVBONY S-II SV160 1.25" 7 nm filter

• a bandpass filter made on a high-quality glass substrate, allowing the S-II band lines to pass through
• filter covered with a full coating with increased scratch resistance
• Half Bandwidth (FWHM) of 7 nm
• high ability to cut light pollution

Technical parameters

• filter type: bandpass filter
• substrate: optical glass B-270
• Filter diameter: 1.25"
• Optical diameter (filter aperture): 26 mm
• filter thickness: 1.85 mm
• filter shape: round
• pass bands: S-II (671.6 nm; 672.4 nm)
• position of the maximum peak of the S-II band transmittance (CWL): 672 nm
• half bandwidth (FWHM): 7 nm
• maximum transmission for the S-II band: 80%
• blocked light pollution bands: mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm)
• optical density equivalent for blocked lines: OD3 in the range of 300 - 1000 nm
• filter coating: multi-layer coating (MC)
• quality of surface finish: λ/4
• parallelism: <30"
• surface quality index: 60/40 (according to MIL-O-13830 standard)
• weight: 5.5g

Set elements

• SVBONY S-II SV160 1.25" 7 nm filter

Guarantee

12 months