Svbony H-Alpha SV227 2 5 nm Narrowband Astronomical Photographic CCD for Deep Sky (SKU: W9187DB) Filters for Astronomy opinie

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The SVBONY H-Alpha 5nm 2" Narrowband Filter (SVBONY, SKU: W9187DB) is designed for astronomical photography in urban and suburban environments. It transmits only a narrow band of light, 5 nm wide, concentrated around the 656.3 nm wavelength (hydrogen alpha emission lines), effectively eliminating most of the artificial sky illumination and infrared radiation in the 700-1000 nm range. This eliminates the need for an additional IR-cut filter. It is intended for use with telescopes with an aperture ratio of f/4 or higher.

Key features

• H-alpha narrowband filter with a transmittance of 5 nm
• light transmission of ≥90% at a wavelength of 656.3 nm
• effective cut-off of the infrared band (700–1000 nm)
• improving the contrast and detail of images in bright conditions
• mounting diameter 2" (thread M48 × 0.75)
• designed for telescopes with a focal ratio of f/4 or greater
• the filter is not intended for observing the Sun

Set components

• SVBONY H-Alpha 5nm 2" filter
• protective box

Technical parameters

• model: SV227
• type: H-alpha filter
• size: 2" (with M48 × 0.75 thread)
• active diameter: 44 mm
• center wavelength (CWL): 656.3 nm
• bandwidth (FWHM): 5 nm
• wavelength range: 300–1000 nm
• peak transmission: ≥90%
• band attenuation: ≥OD5
• substrate thickness: 1.85 mm
• surface quality: 60/40
• surface flatness: 1/4λ
• parallelism: 30″
• thread: M48 × 0.75
• single thread: yes
• weight: 12.5 g

Guarantee

24 months