The Baader polarization filter is meant for integration directly with Baaders Herschel wedge. This filter capitalizes on the partial polarizing effect inherent to the Herschel wedge when it comes to solar images, permitting a very convenient method of variable brightness adjustment in your solar viewing. These filters are meant for visual use, and must be used in conjunction with the Baader Herschel wedge to be safe for Solar use. The filters effect is that of modifying the brightness of the image produced by your astronomy system while it is in use. You rotate the filter/eyepiece combo while it is installed, and it adjusts the brightness of what you are viewing. This can be of great use in finding the optimal brightness level for the most pleasing view.
We sell two sizes of Polarizing filters for visual use with the Herschel (both are produced in Japan for Baader Planetarium). The 1.25" version can be threaded onto an eyepiece directly. The 2" can, of course, be attached to a 2" eyepiece. For the ultimate in convenience, we recommend the 2" Polarizer attached to a T2-15 (2"-1.25" adapter). This allows you to conveniently switch between 1.25" eyepieces without removing the filter, and still maintaining a close position between the eyepiece and filter. Use of a T2-15 also gives you a very convenient means of attaching and removing the Solar Continuum filter.
Safety Note: The Baader Polarization filters must be used in conjunction with the existing ND=3.0 filter and as part of the Herschel Wedge imaging chain to be solar-safe. A polarizing filter is not a stand alone solar filter, but rather a secondary filter to be applied to another for furhter image optimization. It is not safe to use this filter on its own for solar viewing. It must be placed after your ND=3.0 filter in your systems optical train, not before.
Baader Solar Polarization Filter for Herschel Wedge Features
True Optical Quality: Baader glass substrates are of true optical quality. Most other filters are merely made from raw flame-polished, "optically flat", or sometimes a top quality commercially polished filter glass (fine for camera filters), resulting in wavefront deformations that damage image sharpness and contrast when used with telescopes. Baader Planetarium filters are made from striae-free substrates, and actually fine optically polished flat to within 1/4 wave p-v over the entire surface, plane parallel to within 30 seconds of arc! This important and unique custom step adds cost - but the result is a filter that maintains the full wavefront quality of the telescope without double images or ghosting, even at high magnifications. Critical to maintaining this level of flatness are Baader's carefully balanced coating designs, which prevent coating surface stresses from warping the substrate. Such high flatness enables Baader filters to be used far in front of the focal plane, ahead of star diagonals and digital cameras. They are particularly well suited for attachment to the nosepiece of the Maxbright Binocular Viewer (other manufacturer's filters must be used in pairs, attached to the eyepieces).
Filter Durability: Filter durability has always been a hallmark of Baader Planetarium. The multi-layer dielectric coatings are plasma-assisted and Ionbeam-hardened using the latest technology (the coatings are harder than the glass substrate itself!). Baader filters withstand repeated real-world exposure to the elements and physical cleaning. Users need not leave their precious filters dull and dust encrusted to avoid cleaning - Baader filters may be used and cleaned without fear. We have heard sad stories from owners of other simpler soft-coated dielectric filters, who have seen their coatings degrade from normal exposure to moisture, or wiped away from routine cleaning. Some manufacturers even resort to sandwiching their delicate coatings in between two layers of glass (and risking blurred double images as well as eventual degradation from the edges inward). Baader Filters will truly last a lifetime.
Stackability: Unlike other filters, Baader Planetarium filters are truly designed to be stacked and combined. This is possible due to the high optical quality and highly efficient anti-reflection multicoatings. The ability to combine filters opens up many exciting possibilities, permitting unique spectral characteristics unachievable with any single filter.
Special Filter Cell: Baader's special filter cell design offers unique features that enhance their reliability and usability. Though difficult to produce, the ultra-thin filter cell results in the maximum possible clear aperture, in order to minimize vignetting (1.25" Filter clear aperture is 27mm, 2" Filter aperture is 45mm). The special threading has been designed to fit a wide variety of eyepieces and accessories (there is significant variation between the 1.25" filter threading used by eyepiece and accessory manufacturers). The front 'crown' of the filter incorporates milled notches which make handling and threading the filter a more secure operation in the dark.
Low cost: Despite high quality and advanced technology, Baader Planetarium filters are affordable. By leveraging high volumes across all filters in the Baader family, these filters can be offered at very reasonable prices.