UBVRI Photometric Filter 1.25"

The Baader UBVRI Photometric Bessel filter set is a complete photometric system comprising five bandpass filters (U, B, V, R, I) designed for precise stellar photometry and scientific observations. These modern generation filters follow the Johnson/Cousins and Bessel standards, making them compatible with decades of archived astronomical data from institutions like the AAVSO. Manufactured with advanced ion-beam coating technology and Baader's proprietary Life-Coat™ hardened coatings, they feature a standardized 2mm thickness for reliable parfocality with all Baader 1.25" filters and compatibility with standard filter wheels. Equally suitable for both modern CMOS cameras and legacy CCD sensors, these filters deliver the precise transmission characteristics essential for scientific photometry across the UV to near-infrared spectrum.