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Why Purchase from All-Star Telescope?
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Product Description
SVBONY 7nm dual band filter is designed to drastically reduce the effect of light pollution. The 7nm bandwidth means it strongly isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue) from anything else. It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high- and low-pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere.
Dual Narrow Bandwidth H-Alpha/O-III 7nm Narrowband Filter Properly Designed For astrophotography of emission nebulae, planetary nebulae and supernova remnants. The high transmission and sharp cut-off greatly enhances the contrast of image and brings out the most detailed information of those deep-sky objects.
The 7nm dual-band filter allows OIII (500.7nm) and H-Alpha (656.3nm) nebula emission lines to be highly transparent, strongly isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue), and drastically reduces the effect of light pollution.
You can enjoy the fun of nebula shooting at anytime and anywhere in light pollution city or under a full moon. You don't have to to travel through mountains and rivers for your photography, and your traffic fuel and time are also saved.
What's in the Box
Specifications
| Brand | SVBONY | SVBONY |
| Model | SV220 | SV220 |
| Name | Duo-Band OSC Filter | Duo-Band OSC Filter |
| Size | 2-Inch | 1.25-Inch |
| Substrate Thickness | 1.80mm | 1.85mm |
| Clear Aperture | 44mm | 26mm |
| 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 | M48x0.75 | M28.5*0.6 |
| Single Thread | Yes | Yes |
| Net Weight | 12.5g / 0.44oz /0.027lb | 7g |
Additional Articles, Videos, and Links
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