Description:
1¼" x 2 mm Baader H-alpha f/2 Ultra-Highspeed Filter – Premium Grade – with 1¼" (28,5 mm) filter thread. 3.5 nm FWHM (to harmonize the exposure time with O-III / S-II), recommended for extremely fast optical systems from f/3.4 to f/1.8. Specially designed for the special filter requirements when used with fast optics like the Celestron RASA astrographs.
For highest contrast even at strongest light pollution, minimizes star size, emphasizes finest nebula detail – indispensable under Bortle 9/8/7/(6) skies. Reflex-Blocker™ hard coated and planeoptically 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.
Features:
- 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
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
For more information about, Baader H-alpha 1.25 F2 CMOS Optimize Ultra Highspeed Filter 3.5nm website.
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