Description

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". Read More

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

Life-Coat™

Limited-Lifetime-Warranty for CMOS-optimized Baader filters

A Baader Planetarium exclusive. Filters incorporating Baader Planetarium’s Life-Coat™ technology are so durable that Baader Planetarium warrants the coatings for the life of the filter. Baader Planetarium has developed Life-Coat™ using materials and processes that result in coatings which will not degrade or fail for a lifetime. Life-Coat™ coatings resist moisture, temperature extremes, and are hardened to withstand normal cleanings.

Baader Planetarium guarantees their Life-Coat™ coatings will not peel, flake or physically degrade and will withstand repeated cleaning with fine optical cleaning equipment. The Limited Lifetime Warranty applies to the original purchaser and does not cover failure from mis-use, physical damage through improper handling, or improper cleaning.

Specifications

MANUFACTURER	Baader Planetarium
SUITABLE FOR F/RATIO	f/3.4 to f/2.3
TRANSMISSION RANGE	H-alpha / O-III / S-II
FILTER THICKNESS (WITHOUT CELL)	2 mm Thickness = 1.25"/ 2" / 31mm / 36mm 3mm Thickness = 50.4mm / 50x50 / 65x65
HBW (HALFBANDWIDTH)	3.5 nm (H-alpha) / 4 nm (O-III / S-II)
CWL (CENTRAL WAVELENGTH)	656,3 nm / 500,7 nm / 671,7 nm
AR-COATING	Reflex-Blocker™ hard coated, planeoptically polished
SPECIAL FEATURES	CMOS-optimized with Life-Coat™
FILTER SIZE	Multiple
FILTER USAGE	CMOS, CCD, H-alpha, O-III, S-II
FILTER MOUNTED	Mounted (LPFC 6mm) / Unmounted
TYPE OF FILTER	f/3 Ultra-Highspeed
SINGLE OR SET?	Singles and Filter-Set
FILTER SHAPE	round / square (depending on size)

Downloads

Whitepaper addressing filter selection and PRESHIFT

New Baader Filters

Filters

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

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