Baader 1.25" Clear filter #2458415-imaging filter FC-1
Item No. 724-58605
Manuf. No. Baader Planetarium FC-1
Baader Planetarium Clearglass Filter 1.25" with Low Profile Filter Cell (LPFC), FC-1
This filter has the same substrate thickess as the other Baader filters. It is intended for the luminance channel in astro imaging - you don't have to touch the focuser. It can also be used in visual mode: focus perfectly with a bright image and then switch to a narrow band filter without loosing the focus.