Astronomik UHC-E Filter

The UHC-E filter acts as a selective barrier, blocking light pollution and airglow while allowing the specific wavelengths emitted by nebulae—specifically the H-Beta and OIII lines—to pass through. This increases the contrast between the object and the background sky, making faint nebulae appear more distinct.

This is a standard 2-inch round filter, so it is designed to fit into most 2-inch telescope focusers or filter wheels. It is a versatile size that works well with a wide range of standard astronomical equipment.

The UHC-E is designed to be a more accessible entry point into high-quality filtering. While it offers excellent transmission for the key H-Beta and OIII lines, it may have a slightly broader passband than Astronomik's premium professional-grade filters, making it a practical choice for visual observers who want performance without the higher cost.

While this filter is primarily optimized for visual observation, it can be used for astrophotography. However, keep in mind that it is designed to enhance the human eye's perception of contrast, so results may vary compared to specialized narrowband imaging filters.

Astronomik includes a 10-year warranty with this filter. This covers manufacturing defects and ensures the longevity of the optical coatings under normal use.