ALFCUVIRRD31

FCUVIR-RD31

Alpine Astronomical

This 31mm Round, Unmounted Baader CMOS-Optimized UV/IR Bandpass L Filter from Alpine Astronomical reflects harmful thermal radiation in the infrared spectral range and provides 98% transmission over the entire visible spectrum from 420-685nm. It also prevents blurred star imaging with red-sensitive digital and CCD/CMOS cameras. It features a Reflex-Blocker hard coating, which has been planeoptically polished, and has Life-Coat sealed coating edges. It is equally suitable for modern CMOS sensors as well as for older CCD camera technologies. None Reflex-Blocker coatings offer largest ever freedom from halos, even under most adverse conditions concerning aux-opticsProvides increased contrastIdentical filter thickness to existing standards (2mm), with utmost care for parfocalityFWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and S/N ratioBlackened edges all around, with filter-lead side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filterEach filter coated individually, with sealed coating edge (not cut from a larger plate with coatings left exposed)Life-Coat evermore hard coatings enable a non-aging coating for life, even in the most adverse environments