Product Detail
Narrowband Filter 3nm H-Alpha & OIII for astrophotography SV220 1.25inch SVBONY
- Ultra-narrow 3nm (H-Alpha & OIII) bandwidth, ideal for photographing emission and planetary nebulae;
- Minimal halo coating design, effectively blocking excess light and reducing halos;
- Features an M28.5×0.6 thread and a lens barrel size of Φ31.75×7mm. Compatible with mainstream photographic equipment;
This 3nm dual narrowband (H-Alpha + OIII) filter features an ultra-narrow FWHM bandwidth of only 3±1nm, which efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR). Meanwhile, its high transmittance performance of over 85% greatly reduces exposure requirements.Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects. In addition, it adopts multi-layer minimal halo coating design, which effectively reduces glare and halo interference, enhances image contrast and color accuracy, improves the purity of deep-sky photography images.
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Product specification
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1.25 inches
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Mirror ring size
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Φ31.75x7mm
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Thread Type
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Single Thread/Male Thread
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Thread Specifications
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M28.5*0.6
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Material
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6061T aluminum profile
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Substrate Thickness
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2.0 mm
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Aperture of light transmission
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26mm
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Center Wavelength
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500.7/656.3 nm
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Bandwidth/FWHM
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3±1nm
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Cutoff wavelength
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300-1050nm
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Cut-off depth
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average OD5
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Surface quality
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60/40
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Surface flatness
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transmitted wave front PV≤λ/4a
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Parallelism
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30″
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Net weight
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7g
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