Overstock Deal Chroma Sii 3nm Narrowband Filter For Fast Telescopes - 31mm Series [1lPY0ctx]

Chroma SII 3nm Narrowband Filter for Fast Telescopes

The Chroma SII 3nm Narrowband Filter is a specialized tool designed for fast telescopes, offering exceptional performance in astrophotography. This filter is crafted to isolate the spectral emission of singly ionized sulfur atoms, which are commonly found in nebulae. With its narrowband capability, it allows for precise observation of the SII emission lines at 671.6 and 673.1nm, effectively separating sulfur emission from H-alpha emission (656.3nm). The 31mm size makes it compatible with a wide range of telescopes, ensuring optimal performance in your astrophotography endeavors.

Optimized for Fast Focal Ratios

Designed with the needs of fast telescopes in mind, this 3nm narrowband filter is optimized for F/3 beams. Chroma has taken the unique approach of slightly shifting the center wavelength into the red, ensuring that the filter shifts slightly to the blue when used in an F/3 beam. This innovative design maximizes transmission at the nominal wavelength, delivering superior results even with fast focal ratios. For beams faster than F/3, we recommend using 5nm-wide or wider bands for optimal performance. The interference coatings are angle-sensitive and shift to the blue with fast focal ratios, but Chroma's optimization ensures minimal compromise in transmission at the wavelength line of interest.

Best in Class Filters, American Made

Chroma filters are renowned for their excellence in astrophotography, and this SII filter is no exception. Crafted in the United States, these filters adhere to the highest quality standards, ensuring exceptional performance and reliability. As American-made products, they come with the assurance of quality control and craftsmanship. Whether you're a professional astrophotographer or an amateur looking to enhance your observing experience, these filters are designed to satisfy any imager's needs. The benefits of owning a Chroma filter are numerous, including top-grade filters with impeccable quality control, availability in any standard size, and the peace of mind that comes with purchasing an American-made product. Upgrade your telescope setup with the Chroma SII 3nm Narrowband Filter and experience the difference in your astrophotography results.