ToupTek Narrowband (4 nm) SHO Filter Set (36 mm) offers an unbeatable price/performance ratio for observers dedicated to narrowband astrophotography. The filter set allows for detailed photography of astronomical objects (e.g., emission nebulae) along the hydrogen-alpha (Ha), oxygen-III (OIII), and sulfur-II (SII) lines. The filters, with a passband of only 4 nm, are excellent for reducing the effects of urban light pollution.
The outstanding feature of the ToupTek Narrowband SHO Filter Set is the 4 nm bandwidth, which ensures maximum contrast and detail richness. The filters are manufactured from special, high-purity, and thermally stable quartz-based optical glass. The surface treatment is done using IAD technology, which provides a more uniform and corrosion-resistant quality compared to traditional vacuum deposition. All these features guarantee excellent image quality and long lifespan.
Main features of the filter set:
- Passband: 4 nm
- Filter size: 36 mm
- H-alpha central wavelength: 656.3 nm
- SII central wavelength: 671.6 nm
- OIII central wavelength: 500.7 nm
- Transmission: >90%
- Coating: IAD (Ion Assisted Deposition) and anti-reflective coating
- Material: Quartz optical glass
- Blackened filter edges
When using the filters, ensure that the side with the slightly wider rim faces the telescope!
