All-in-one Optolong Sii Narrowband Telescope Filter - 2" Flash Sale: 95% Off [ETbKqZVI]

All-in-one Optolong Sii Narrowband Telescope Filter - 2" Flash Sale: 95% Off [ETbKqZVI] for Exceptional Deep Sky Imaging

The Optolong SII Narrowband Telescope Filter is a cutting-edge tool designed for deep sky imaging enthusiasts. This 2" filter offers an extra narrowband SII-CCD 6.5nm bandwidth, centered on a wavelength of 672nm, perfect for nebula observation. Its primary function is to enhance the visibility of celestial objects by selectively allowing Sulfur II light to pass through, while blocking unwanted artificial and natural light sources, such as mercury vapor, sodium vapor lights, and atmospheric emissions. This filter is an essential component for achieving stunning, Hubble-like images of deep sky objects.

Technical Specifications and Performance

The Optolong SII filter is crafted with precision and quality in mind. It features a Schott substrate material and a thickness of 2.0mm, ensuring durability and optimal performance. The surface quality meets the stringent standards of 60/40 (Refer to MIL-O-13830), and it is finely optically polished for an accurate 1/4 wavefront and <30 seconds parallelism over both surfaces. The filter boasts an impressive 80% transmission, with the SII line at 672nm. Additionally, the precision off-band blocking minimizes light pollution and enhances the contrast between nebulae and the night sky. The multi-layers anti-reflection coating and non-cementing optical substrate coating further contribute to the filter's durability, resistance to scratching, and stability on the central wavelength, even under temperature changes.

Practical Applications and Benefits

The Optolong SII Narrowband Telescope Filter is ideal for a variety of astrophotography applications. It can be used in conjunction with H-alpha and OIII-CCD extra narrowband filters (SHO Set) for tricolor CCD astrophotography, allowing for stunning tricolor images even in heavy light pollution. This filter enables you to capture images of celestial objects such as the famous “Pillars of Creation” (M16 Eagle Nebula) with a Hubble-like appearance. The SII filter does not eliminate light pollution or increase the brightness of objects, but it does enhance the contrast, making nebulae stand out against the night sky. Whether you are a hobbyist or a professional astrophotographer, this filter is a valuable addition to your equipment, enabling you to capture breathtaking images of the cosmos.