Baader 3.5 / 4nm f/3 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II)

Baader has released a whitepaper guiding you how to select the best filter for your telescope system, and why this is important in relation to "PRESHIFT" to stay "on band".

• Baader H-alpha / O-III / S-II f / 3 Ultra-Highspeed Filter Set - Premium Grade
• 3.5 / 4 nm half width (to harmonize the exposure time of H-alpha with O-III / S-II), recommended for extremely fast optical systems from  f/3.4 to f/2.3
• Specially designed for the special filter requirements when used with fast f/3 optics
• Enables the highest contrast even with the strongest light pollution, minimizes the size of the stars, makes the finest nebula details accessible - indispensable under Bortle 9/8/7/(6) sky
• Reflex-Blocker ™ hard-coated and optically polished - with sealed coating edges (Life-Coat ™)
• Blackened edges all around, with a filter front indicator in the form of a black outer edge on the front
• Optimized for modern CMOS cameras, but ideally suited for CCD camera technologies

The new generation of Baader CMOS-optimized filters features:

• CMOS-Optimized Baader Filter
• Increased contrast
• Ever more narrow passbands
• 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 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 read more)
• Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

Technical Specifications

In the Box

• Baader 3.5 / 4nm f/3 Ultra-Highspeed Filters
  
  

Warranty & Manuals

Baader Limited Lifetime Warranty