ToupTek Astro SHO Narrowband Filter Set

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

Narrowband filters isolate selected emission lines for monochrome deep-sky imaging and SHO channel capture.

ToupTek Astro SHO narrowband filters are precisely tuned to the three primary ionized emission lines of star-forming regions:

Hα (656.3nm)
SII (671.6nm)
OIII (500.7nm)

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

Technical Parameters

Size Specifikationer 36mm (unmounted) / 1.25" / 2"

Glass Thickness 2mm

Transmission >90%

Glass Material Quartz Glass

Frame Material Aluminiumlegering

OD Value ≥5.0

Transmission Ranges

SII Center Wavelength 671.6nm

Hα Center Wavelength 656.3nm

OIII Center Wavelength 500.7nm

Full Width at Half Maximum (FWHM)

36mm: Hα (4nm) / SII (4nm) / OIII (4nm)

1.25" & 2": Hα (7nm) / SII (7nm) / OIII (7nm)

Surface Treatment: Dual-side high-precision optical polishing

Coating Technology: IAD (Ion Assisted Deposition)

Coating System Design: AR anti-reflection coating + quartz glass + precision cut-off coating layer

Viktiga funktioner

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

SII SII Filter: Center wavelength 671.6nm, FWHM 4nm.
Supports ionized sulfur channel capture and structural contrast when combined with Hα.

Hα Hα Filter: Center wavelength 656.3nm, FWHM 4nm.
Hydrogen-alpha channel for nebula morphology.

OIII OIII Filter: Center wavelength 500.7nm (OIII emission line), FWHM 4nm.
OIII channel for high-energy excitation regions and blue-green emission structures.

*1.25-inch and 2-inch filters have FWHM of 7nm.

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

The coating stack combines single-side cut-off coating, front-surface AR coating, and edge blackening to reduce internal reflection and stray light.

All channel filters achieve OD≥5.0 cut-off depth to block non-target spectral ranges and reduce channel crosstalk.

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

36mm filters: Feature recessed black ring facing telescope for quick orientation identification
1.25" and 2" filters: Equipped with threaded aluminum frames for direct screw-in installation

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

36mm: Recommended for APS-C and smaller sensor formats

1.25": Recommended for 1-inch and smaller sensor cameras

2": Recommended for full-frame and smaller sensor cameras

Compatible with various brands of 7-position 36mm, 8-position 1.25-inch, and 5-position 2-inch motorized filter wheels.

Spectral Response Curves

Spectral Chart Reading Guide

Horizontal axis represents wavelength (unit: nm), vertical axis represents transmission (percentage %)
Blue line: SII (672.4nm) Red line: Hα (656nm) Green line: OIII (500.7nm)
Emission nebula signal bands are primarily located at 656nm (Hα), 500.7nm (OIII), and similar wavelengths
Light pollution peaks typically occur near 540nm and 590nm (sodium/mercury lamp bands)

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

IC5070

Photographer: voice

Telescope: Sky-Watcher

Mount: UMI

Camera: ToupTek Astro ATR2600M

Filters: ToupTek Astro 36mm LRGB&SHO

Exposure: Hα: 30×600s ; SII: 30×600s ; OIII: 30×600s

Total exposure time: 15 hours

IC443

Photographer: voice

Telescope: Sky-Watcher F3.4

Camera: ToupTek Astro ATR2600M / ATR2600C

Mount: UMI

Filters: ToupTek Astro 36mm HSO

Processing: Narrowband composite using HSO channel mapping

Total exposure time: 20 hours

NGC2237

Photographer: 原上行川

Telescope: Askar SQA55

Camera: ToupTek Astro ATR2600M

Mount: iOptron HAE16C

Filters: ToupTek Astro 36mm HSO

Wireless Controller: StellaVita

Exposure: Hα: 71 ; OIII: 63 ; SII: 49

Total exposure time: 15 hours

M16

Photographer: Yahushua

Telescope: Askar 130HNT28-AL

Camera: ToupTek Astro ATR585M

Mount: iOptron CEM26

Guide Camera: G3M2210M

Filters: ToupTek Astro 1.25" HSO

Total exposure time: 7 hours

NGC6357

Photographer: voice

Telescope: Sky-Watcher

Camera: ASI2600M

Filters: ToupTek Astro 2" HSO

Mount: UMi 17

Exposure: Hα: 36×600s ; SII: 36×600s ; OIII: 36×600s

Total exposure time: 18 hours

Installation Guide

36mm Unmounted Filters

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

1.25" and 2" Filters

Screw directly into the filter wheel.

Garanti och service

Quality Assurance Testing

Every filter undergoes spectral testing before shipment to verify optical performance consistency.

Warranty Policy

SHO-filter från ToupTek Astro stöder exakta filterbyten, LRGB- eller smalbandsbildtagning och jämna deep-sky-resultat.

Teknisk support

For assistance, please contact our support team:
ToupTek Astro Technical Support

Viktiga anmärkningar

Color Variations: Filter coating colors may appear different under various lighting conditions and viewing angles—this is a normal optical phenomenon.

Produkt Improvements: Specifications and appearance may be updated as part of product refinement. Refer to actual delivered goods.

ToupTek Astro SHO Narrowband Filter Set