SVBONY SV220 Telescope Filter, H-Alpha & OIII, 7nm Dual-Band 1.25" Nebula Filter for Astrophotography
9 | ReviewsKey Features
SV220 1.25 inches Dual-Band Nebula Telescope Filter for Astrophotography
The filter is suitable for those astronomers who are already imaging using color cameras, and don't want to transition to a monochrome camera set. Be the efficient astronomer with SV220 Dual Band Filters.
This SV220 telescope filter is also a fantastic solution to dealing with light pollution that is becoming more and more prevalent.
The filter has relatively wide bandpasses, especially at the OIII wavelength (500.7nm width).
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Specifications
| Brand | SVBONY | SVBONY |
| Model | SV220 | SV220 |
| Name | Duo-Band OSC Filter | Duo-Band OSC Filter |
| Size | 1.25-Inch | 2-Inch |
| Substrate Thickness | 1.85mm | 1.80mm |
| Clear Aperture | 26mm | 44mm |
| Wavelength Range | 300-1100nm | 300-1100nm |
| FWHM | OIII (7nm) & HA (7nm) | OIII (7nm) & HA (7nm) |
| Blocking | >OD5 | OD5 |
| Peak transmittance | 500.7nm@T>90%; 656.3nm@T>94% | 500.7nm@T>90%; 656.3nm@T>94% |
| Surface Quality | 60/40 | 60/40 |
| Surface parallelism | 1/4λ | 1/4λ |
| Thread | M28.5*0.6 | M48x0.75 |
| Single Thread | Yes | Yes |
| Net Weight | 7g | 12.5g / 0.44oz /0.027lb |
Features
1. Reduce light pollution; SV220 telescope filter can greatly reduce the interference from natural light sources such as moonlight or artificial light pollution such as street lighting
2. Astrophotographic;the filter enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; the filter allows high-contrast imaging even in areas with strong light pollution
3. Wide range of application; the 1.25 inch dual band filter can be used with most cameras and filter wheels; no worry about not applicable
4. Improving contrast; an increase in contrast can be perceived as an increase in brightness; the filter makes the contrast of the nebula and sky background increase; not the nebula brighter
5. Strong applicability; the filter applicable to SVBONY's electronic cameras and astronomical cameras which the apertures are 1.25-inch; but for the different telescopes and cameras; the installation order of filters is also different
6. Easy to use; the dual-band filter makes it possible to simplify and decrease the difficulty and cumbersomeness of post-processing for users
7. Standard 1.25 inch size; the 1.25 inch size of the filter fits most telescope; and the weight is 5.4g; its central wave length reach 500.7nm
