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Astrodon 31mm SII Filter 5 nm FWHM for QSI


SKU: SII5_31R
PRICE: 330.00

Astrodon 31mm SII Filter 5 nm FWHM for QSI Description
Imaging with narrowband filters has become very popular. It is an ideal tool to observe structure in emission nebula because it produces very high contrast, and is a wonderful means to enjoy our hobby even when the moon is up.

The Astrodon OIII & SII filters have become the preferred choice of imagers for the following important reasons:

• Parfocal with all Astrodon LRGB, C, and H-alpha filters eliminating the need for refocusing.

• A narrow 5 nm spectral bandwidth (full width at half maximum transmittance) consdered a "sweet spot" among commercially available filters to achieve the highest signal in the shortest time while keeping stars reasonably small.

• Incredible blocking of light outside the bandpass to better than 0.0004% to achieve very high S/N and high contrast, even with a bright moon nearby.

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