ALFC2U

FC-2U

Alpine Astronomical

This Baader Clearglass Filter 2" Unmounted for FCCT (CMOS-Optimized) from Alpine Astronomical is used to focus a camera when using very narrow band line filters (due to same mechanical thickness) with no halos, reflection, or ghosting. It is also used for dust protection.None Optimized for modern CMOS cameras, but likewise excellent for older CCD camera technologies Anti-reflection RGB filter (red/green/blue) with extremely high transmission of the respective color channel, thus simultaneously reducing stray light and reflections to an unprecedented level Balanced RGB design allows subframes to be taken with the same exposure time - extremely important for automated imaging tasks Increased contrast Reflex-Blocker coatings FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio Blackened 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 filter with filter-lead-side-indicator in the form of a telescope-sided black outer rim Each filter coated individually, with sealed coating edge, not cut out of a larger plate with coatings left exposed Reflex-Blocker hard coated and planeoptically polished, with sealed coating edges (Life-Coat)