Chroma Photometric Johnson-Bessell R Telescope Filter

This filter is designed for precision photometry, allowing astronomers to measure the brightness of celestial objects within a specific wavelength range. It is essential for scientific data collection rather than just visual observation.

The filter is designed for a 1.25-inch connection interface. As long as your telescope or filter wheel accepts standard 1.25-inch mounted filters, it should be compatible.

While it can be used visually, it is specifically engineered for photometric data collection. You will likely find that it significantly alters the color balance of your view, which is ideal for scientific analysis but may not be preferred for casual stargazing.

A 3mm filter thickness is standard for these optics, but it will cause a slight shift in your focal point. You will need to refocus your telescope after installing the filter to maintain sharp image quality.

Broadband refers to the filter's ability to transmit a relatively wide range of wavelengths within the R-band spectrum. This allows enough light through to capture accurate brightness measurements of stars and other deep-sky objects.