Astronomical Photographic Filter 1.25 Inch Narrowband For Deep Sky

Description

Astronomical Photographic Filter 1.25 Inch Narrowband For Deep Sky
*Astrophotography under a light-polluted night sky can be difficult. The solution is SVBONY OIII-CCD 7nm Narrow-Band filter; The SVBONY OIII-CCD 7nm Narrow-Band Filter works to filter out a large part of this light pollution(both artificial and natural)
*Sturdy frame and high-quality glass
The frame is made of anodized aluminum and CNC metal processing technology, which is durable; The lens is made of high-quality schott glass imported from Germany
*Multi-coated lenses
The lens uses ion-assisted deposition technology for multi-layer coating; which can not only increase the scratch resistance of the lens; but also ensure stability on the central wavelength
*Increase image contrast
The 7nm high transparency allows the emission spectrum of the nebula to collect as much energy as possible through cumulative exposure; It has higher contrast and makes the nebula's layers richer and more delicate and prevent glaring and ghosting
Features
1.Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
2.CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
3.Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
4.Material from Germany, 1.85mm thick
5.Surface quality, according to MIL-O-13830, is 60/40
6.80% transmission at OIII line 500nm
7.Infrared wavelength 400-700nm cut-off
8.Thin metal cells have a clear aperture of 26mm for 1.25 inch filters
9.Each filter comes with a plastic case with high pressure EVA case lining
Specification:
Size: 1.25Inch
Filter Type: OIII Filter
Substrate: B270
Substrate Thickness: 1.85mm
Wavelength Range: 300-1000nm
CWL: 671.6nm
FWHM: 7nm
T peak: 80%
Blocking: OD3 @300-1000nm
Clear Aperture: 26mm
Surface Quality: 60/40