USED - Oiii 4nm Narrowband filter 36mm unmounted

USED GEAR INFORMATION This filter is in excellent condition. It does not appear to have any defects. They have been inspected, cleaned, and repackaged. This new generation of Baader CMOS filters features: CMOS-optimized Baader Filters Increased contrast Ever narrower passbands Reflex-Blocker ™ coatings , for greatest 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 parfocality 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 Each filter coated individually , with sealed coating edge (NOT cut out of a larger plate with coatings left exposed) Life-Coat™ : evermore hard coatings to enable a non-aging coating for life – even in the most adverse environment Baader O-III 36mm ultra-narrowband filter (4nm) – CMOS-optimized Product Details SKU 2961402 EAN Code 4047825047779 Manufacturer Baader Planetarium Net weight (kg) 0.00 Optical Specifications AR coating Reflex-Blocker™ hard coated plane-optically polished CWL (Central Wavelength) 500.7 nm HBW (Halfbandwidth) 4 nm Suitable for f/ratio > f/3.4 Transmission Range O-III Type of Filter Ultra-Narrowband Mechanical Specifications Filter mounted Unmounted Filter shape round Filter size 36 mm Filter Thickness (without cell) 2 mm Usage & Features Filter Usage CMOS CCD O-III Single or Set Single Filter Special Features CMOS optimized with Life-Coat™