The SHO filter is highly transparent, allowing the emission spectrum of the nebula to collect as much energy as possible by accumulating exposure.
1.25" SHO Filter Set H-Alpha OIII SII 7nm
Cool, I've been looking for this one for a long time
deSara thanks for my account now
Thanks
hi all users
Specifications
| Spec | SII 7nm | OIII 7nm | H-Alpha 7nm |
| Size | 1.25-Inch | 1.25-Inch | 1.25-Inch |
| Transmission Line Wavelength | 672nm | 500nm | 656nm |
| T peak | 80% | 80% | 80% |
| Substrate | B270 | B270 | B270 |
| Wavelength Range | 300-1000nm | 300-1000nm | 300-1000nm |
| Blocking | OD3 @300-1000nm | OD3 @300-1000nm | OD3 @300-1000nm |
| Clear Aperture | 26mm | 26mm | 26mm |
| Surface Quality | 60/40 | 60/40 | 60/40 |
| Surface parallelism | 1/4λ | 1/4λ | 1/4λ |
| Parallelism | 30" | 30" | 30" |
| Net Weight | 5.5g / 0.19oz | 5.5g / 0.19oz | 5.5g / 0.19oz |
| Glass Thickness | 1.85mm | 1.85mm | 1.85mm |
Features
1. Optical high precision double sided polishing to ensure that the parallelism is higher than 30 inch and high flatness 1/4λ; to ensure that does not affect the image quality
2. Precision double sided optical coating; non two piece glue; effectively improve the transmittance and cut off depth
3. 300-1000nm wavelength range; Oxygen III 7nm extra narrowband filter transmits a 7nm bandwidth of light that is centered at 500nm
4. Standard 1.25 inch interface; thin metal cells have a clear aperture of 26mm for 1.25 inch filters
5. 300-1000nm wavelength range; the Sulfur II 7nm extra narrowband filter transmits a 7nm bandwidth of light that is centered at 672nm