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  4. Quad BP Filter III (Cytron Japan Co., Ltd.)
Quad BP Filter III-Quad BP Filter III
Quad BP Filter III-Cytron Japan Co., Ltd.

Quad BP Filter III
Cytron Japan Co., Ltd.

About This Product

Quad BP (quad bandpass) filter is an interference filter that transmits wavelengths around the four main emission lines emitted by celestial bodies, Hα, Hβ, OIII, and SII, and cuts other wavelengths. Since it cuts wavelengths other than those near the four main emission lines, you can expect a powerful light pollution cutting effect. It is popular for nebula photography and television viewing in urban areas using digital single-lens reflex cameras and mirrorless cameras. The conventional QBP filter was designed to gradually transmit near-infrared rays of 900nm or more, but the wavelength range cut has been extended to 1,100nm, resulting in the "Quad BP Filter III." Prevents halos from appearing around bright stars when used in conjunction with an achromatic mirror. We have 48mm diameter and American sizes. Product features

■4 bright line transmission type

By mainly transmitting wavelengths near the four main emission lines (Hα, Hβ, OIII, and SII) emitted by celestial bodies, and cutting out other wavelengths, the nebula can be seen even in light-polluted areas.

■Cuts wavelength range up to 1,100nm

The conventional QBP filter was designed to gradually transmit near-infrared rays of 900 nm or more, but when used in conjunction with an achromat mirror, a phenomenon was observed in which bright stars were wrapped in a halo. By extending the cut wavelength range to 1,100nm, this product suppresses the appearance of halos around bright stars when used in conjunction with an achromatic mirror.

■Reliable domestic quality

Like our previous products, it is made in Japan and is reliable. A multilayer film is deposited on both sides of a highly precisely polished glass substrate using IAD (ion assisted deposition) coating by a major Japanese deposition manufacturer. The membrane surface boasts high density, homogeneity, and stability.

■48mm diameter, American size

We have a wide range of highly versatile filter thread diameters, so you can use it with many telescopes.

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    Quad BP Filter III

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1 Models of Quad BP Filter III

Image Part Number Price (excluding tax) Filter diameter Country of origin
Quad BP Filter III-Part Number-Quad BP Filter III

Quad BP Filter III

$ 123.50〜

48mm, American size

Japan

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Cytron Japan Co., Ltd.

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Optical Filters
Optical Filters　Cytron Japan Co., Ltd.
Cytron Japan Co., Ltd.

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