Feature(may vary by option.)

●The Svbony 2-inch UHC telescopic filter is designed to improve the image contrast of observed objects. It can be used not only for sky observation but also for astrophotography
●95% transmission of the main mist emission lines and 0.1% off-band transmission, especially the main emission lines of artificial light pollution, ideal for observing cities and suburbs
●The double-sided multi-layer coating and the back increase the broadband penetration film reduces reflected light and increases contrast and image sharpness
●Optical glass lens, aluminium frame. Precision polished substrate. Good parallelity and surface precision ensure long service life
●Includes a sturdy plastic box which is convenient to carry and store

[2in]




[1.25in]





Description

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telescopic filtertelescopic filter

spectral curve

The main emission lines of fog: H-ß486.1nm OIII 495.9nm OIII 500.7nm H-α656.3nm

The main emission lines of artificial light pollution: Hg 435.8nm 546.1nm 577nm 578.1nm

Na 598nm 589.6nm 615.4nm 616.1nm

--95% transmission of the main emission lines of the fog and 0.1% transmission of the off-band, especially the main emission lines of artificial light pollution; ideal for observing in cities and suburban areas

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INCREASES CONTRAST AND IMAGE SHARPENESS:

The double-sided multi-layer coating and wide-band penetration film on the back reduce reflected light and improve the permeability of the main emission lines of the mist. This is also why the filter has a different colour in different angels.

Ion assisted deposition (IAD) coating teconology make the multi-layer more compact, low temperature drift, more stable image.

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telescopic filtertelescopic filter

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telescopic filtertelescopic filter

Standard 2" thread

2 inch thread fits all 2 inch eyepieces, perfect for sky observation and astrophotography.

Durable and hard to deform:

Optical glass lens, aluminium frame, precision polished substrate good parallelism and surface precision ensures you long time use.

Firmer film, high hardness, low temperature drift, more stable.

Including a sturdy plastic box convenient to carry and storage.

Specification:

Brand: Svbony

Type: UHC filter

Material: Optical glass lens, aluminium frame

Drum diameter: 2

Thread: M48x0.75mm

Net weight: 12.9 g / 45 oz

Glass thickness: 1.85 mm

Package includes:

1 x Svbony 2 inch UHC filter, 1 x sturdy plastic case