Cytron Japan Quad BP Filter III+ (quad band pass filter) American size

Conventional-QBP filters are designed to infiltrate nearly infrared light of 900 nm or more, but when used in tandem with an acromat mirror, the fluorescence caused by halos was shown. By lengthening the cutting wavelength to 1,100 nm, this product inhibits the appearance of halos around the star when used in tandem with an acromat mirror. By penetrating the wavelength range around the main 4 spectral lines (Hα, Hβ, OIII, SII) of celestials and cutting other wavelength ranges, it also evens out nebulae in Gwanghae.

filter size: American size

The thread pitch has changed (inch to millimeter thread)

thread diameter: 28.575mm/thread pitch: 0.6mm/filter thickness: 1.5mm

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