Chroma Photometric Sloan DSS U Telescope Filter

The Sloan DSS U filter is designed for photometric imaging, specifically isolating the ultraviolet portion of the spectrum. It is an essential tool for astronomers performing precise stellar classification and color-magnitude analysis.

This filter is a 50mm square glass optic. While it is versatile, it is not a drop-in filter for standard 1.25-inch or 2-inch eyepiece barrels; it is intended for use in filter wheels or custom imaging setups that accommodate square filters.

The 3mm thickness is standard for high-quality photometric filters and provides excellent structural rigidity. However, you should account for this thickness when calculating your back-focus requirements to ensure your imaging system reaches proper focus.

While it is constructed from high-quality glass, this filter is specifically engineered for photometric data collection and astrophotography. It is not designed for visual observation, as the U-band transmits light in the ultraviolet spectrum, which is largely invisible to the human eye.

Yes, it includes a complimentary TPO filter case. This case is designed to keep the glass clean and protected from scratches or dust when the filter is not installed in your imaging train.