The Baader CMOS-Optimized Clear Glass Focusing Filter is a 47.4mm round unmounted filter for FCCT. Made with Baader Premiium grade impermeable 2" RGB-C Clearglass, this filter is comes without the filter cell, and is approximately 2mm thick. 

Baader's clear glass filters are used to focus cameras while they use thin and narrow band line filters. 

This filter also works as a clear glass filter for dust protection. 

• 47.4mm x 2mm premium grade RGB-C Clearglass filter
• No Halos, reflections, or ghosting
• Comes with nonaging sealing along the filter edges

• Baader CMOS Optimized Clearglass Unmounted Filter for FCCT - 2"