Baader H-alpha 2" f/2 Highspeed-Filter (6.5nm) – CMOS-optimized - 2961153

Highlights

• 2" x 2 mm Baader CMOS H-alpha f/2 High-speed Filter – Precision Grade – with 2" (M48) filter thread
• 6.5 nm FWHM, recommended for extremely fast optical systems from f/3.4 and faster
• Specially designed for the special filter requirements when used with extremely fast f/2 optics like the Celestron RASA astrographs
• Reflex-Blocker™ hard coated and Plane-optically polished – with sealed coating edges (Life-Coat™)
• Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim
• Optimized for modern CMOS cameras, but likewise excellent for CCD camera technologies
• Mounted in Baader Low Profile Filter Cell (LPFC) – 6 mm height

This new generation of Baader CMOS-filters features:

CMOS-optimized Baader Filters

• Increased contrast
• Ever more narrow band-passes
• Reflex-Blocker^™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
• FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio
• Identical filter thickness to existing standards, with utmost care for remaining Par focal
• Blackened edges all around, with filter-lead-side-indicator in the form of a black front side outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
• Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
• Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment