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Astrodon 50mm Square SII Filter 5 nm FWHM

PRICE: 875.00

Astrodon 50mm Square SII Filter 5 nm FWHM 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 H-a filter has become the preferred choice of imagers for the following important reasons:

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

• An incredible 90-92% transmittance at the SII emission wavelength to reduce your total imaging time.

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

• A single substrate to eliminate internal reflections that cause the halos around bright stars seen in many other SII filters.

• 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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