Baader Herschel Safety Wedge Solar Prism - Version "V"
The Baader Planetarium 2" Herschel Safety Wedge Solar Prism offers the finest white-light solar views obtainable. The Herschel wedge prism provides safe full-aperture solar views without any image degradation. Views are noticeably superior in resolution and contrast to even the very finest and most expensive glass objective solar filters and films. The amount of Sunspot detail and surface granulation will surprise even the most experienced solar observer. Penumbra resolve into a staggering range of contrasts and fine wispy details. The solar disc is set against a jet-black sky, like observing the full moon at night! With our Herschel Wedge Prism, it becomes obvious that the lack of detail and contrast experienced with all other white-light filters was not so much due to the atmospheric seeing as you had thought. A further benefit is the true unfiltered nature of the spectrum passed by the filter. Unlike objective solar filters, the Baader Herschel Wedge does not selectively filter any of the visual wavelengths. This provides a true white-light view, and permits the use of additional eyepiece filters to selectively study any bands desired, without the compounding effects of a pre-filter.
The Baader Safety Herschel Wedge is the finest solar wedge ever produced for amateur use. It is the culmination of Baader's many years of experience in the design and production of Herschel Wedges. Utilizing a precision 2" genuine Zeiss ultra-smooth wedge prism and proprietary Baader optical design for stray light elimination, the Baader Safety Herschel Wedge maximizes image contrast and sharpness. While other herschel wedges use a low-quality Chinese or other generic glass wedge prism, the large first-surface Zeiss produced prism has high surface quality and smoothness over its entire surface which will not break down at magnifications over 100x, permitting full-disc photography and imaging with no resolution or contrast loss across the full field.
As supplied, a special precision polished and coated Baader ND=3.0 filter is permanently pre-installed within the wedge housing (it MUST be present for any and all visual observation). This critical safety feature ensures that the ND filter will always be present, with no chance of accidentally viewing the unfiltered light as with some other herschel wedges.
The genuine Baader ND filters have been designed and produced specifically for Herschel usage, and are the only ND filters ever to be produced with both surfaces fine-optically polished and anti-reflection multicoated. These additional steps provide the highest image quality across the entire field, preventing any image breakdown and scattered light which are inherent in standard ND filters.
The modular design of the Baader Herschel Wedge incorporates a removable 2" nosepiece and Deluxe 2" Clamping eyepiece holder (with integral brass clamp ring and dual clamp screws). The threaded machined aluminum body permits attachment of a full range of Baader accessories, as well as for close-coupling of cameras and Baader binoviewers.
Baader Herschel Safety Wedge Solar Prism Features...
- The latest version incorporates an innovative Light Trap developed by Baader Planetarium. This development takes the Herschel Wedge into the 21st Century, by rendering the output energy cool and diffused! In all other herschel designs, the waste energy is simply deflected out of the rear face of the prism by an angled mirror. Though quite safe with careful use, the user still had to be aware not to place any object (or body part..) into this output beam (and to prevent any casual onlooker from carelessly staring up into the beam). Thanks to Baader Planetarium, this concern has now been completely removed. In place of the typical output mirror is a coated multi-layered perforated steel screen. The bright light and heat energy are harmlessly diffused. Even after prolonged observations through large refractors, the light trap remains cool. You can even place a hand below the output and no heat can be felt (also, no tempting or hazardous bright output for careless eyes to see).
- Baader now offers two versions of the Herschel Wedge: The lower priced Version-V (visual, sold separately) comes with the pre-installed ND=3.0/1:1000 (required for safe viewing), and a 2" Continuum Filter. The Version-P (photographic, included in this package) starts with the Version-V and adds 3 additional Baader ND filters (ND1.8/1:64, ND0.9/1:8, ND0.6/1:4 ). The additional ND filters are handy for further dimming the image for white light viewing, or attaching to eyepieces or a T2-15 Reducer, and are particularly useful for imaging.
- All of the fine-optically polished genuine Baader ND filters now incorporate special anti-reflection multi-coatings to further eliminate light scatter and ghosting for maximum image contrast. The result is image quality unachievable with any other ND filter.
Please Note: The Herschel Wedge is only recommended for use with refracting telescopes, NOT Schmidt-Cassegrain, Maksutov, or any other reflecting telescopes. This is a professional-quality white light (not H-Alpha) solar filtration system, whose basic design concept has existed for almost as long as the telescope itself. Like glass or mylar film objective solar filters, it is completely safe if used properly and common sense precautions are always observed. See Safety Guide PDF in link below.
Similar in length to any 2" diagonal, the Baader Herschel Wedge requires more back-focus than a 1.25" accessory. The path length of the Herschel is 128mm, as measured from it's front face to the top of the 2" eyepiece holder. Since most 2" eyepieces have their field stops well below the main eyepiece body, most telescopes will need less than 128mm of back focus to accommodate the Herschel. Most telescopes with 2" focusers will have no problem providing this amount of back-focus (in-travel). However, some telescopes, such as many TeleVue refractors, provide limited back-focus that may require a shorter path length for some eyepieces.
Link to Downloadable Safety Guide: http://alpineastro.com/Solar_Observation/HerschelWedge.htm
Baader Planetarium Product Number: HERSCH-V
- Additional Information
SKU BA-HERSCH-V Manufacturer Baader Glass, Film, or Herschel? Herschel Wedge Warranty 1 Year Warranty Filter Diameter N/A Filter Fits Telescope OD Range of... N/A
- Included Items
- Baader Herschel Safety Wedge Solar Prism - Version "V"
- Pre-installed ND=3.0 Filter
- Continuum Filter
- Protective Case
- Questions & Answers
Product QuestionsWhat is the maximum objective aperture that the Baader Herschel Safety Wedge can safely handle? My personal scope is a 6-inch refractor but I would like to try it with a vintage scope that has a 9-inch lens and thus collects much more solar energy. What is the safe upper limit?Question by: James Guilford on Jun 27, 2016 1:08:00 PMAs I'll quote below, Baader Planetarium has tested with refractors as large as 8". I would advise creating a sub-aperture mask for your 9", so as to reduce the amount of light both striking the lens(es) and reaching the prism.
"Maximum telescope size: We have used the Herschel prism successfully with telescopes with 6 and 8 inch
aperture. Because of the huge amount radiation, we recommend to point the telescope away from the sun when you do not observe - make a break every hour or so to give the equipment time to cool down. The limiting factor for the focal length is the 2” adaption. The image of the sun in the image plane is ca. 1cm per 1m focal length, so focal length should not be longer than ca. 4,5m. If you can project the sun with your telescope and a 2”- focuser, you can also use the Herschel prism."
Answer by: Eric Blackhurst (Admin) on Jun 27, 2016 2:37:00 PMHow is UV light filtered to protect the viewer's eye with the Baader Herschel Safety Wedge Solar Prism?Question by: Edward 007 on Oct 21, 2014 8:08:38 AMThe first prism surface directs 95.4% of the light including UV and NIR into the heat trap and cool ceramic tile and reflects only 4.6% toward the eyepiece. Then, an ND3.0 filter cuts the light intensity across the visual spectrum by 1000x and nearly cuts the UV to nothing (most glass filters and lenses have near 100% cut of UV light beyond 325nm even without the ND3.0 coatings). For further reduction, use the included Solar Continuum filter, which only passes from approximately 540 to 550 nm and cuts longer and shorter wavelengths from UV out to NIR.Answer by: Chris (Admin) on Oct 21, 2014 10:47:29 AMQuestion by: Redondo on Aug 21, 2016 11:51:00 PMAs long as you have only the M72 to 2" compression adapter on the rear focuser and install this Herschel Wedge as if it was a conventional diagonal, you should have no issues safely and successfully observing the sun with this product and that scope. If the image is too bright, use the included Solar Continuum filter or stack another ND filter in front of the eyepiece to bring the image down to a comfortable level.Answer by: Chris Hendren (Admin) on Aug 22, 2016 1:25:00 PMQuestion by: Ryan Hannahoe on Jul 4, 2016 12:36:00 PMYes, although you may need additional filtration due to the larger aperture. Baader recommends refractors in the 90-110mm range, but they note that by stacking additional ND filters *after* the wedge (just in front of the eyepiece) and/or by adding the included 10nm bandpass solar continuum filter, the brightness can be brought down to a comfortable level. Never remove the ND3.0 filter! Please see the manual here for safety tips: http://www.baader-planetarium.uk.com/en/pdf/HERSCHEL_PRISM_MANUAL.pdfAnswer by: Chris Hendren (Admin) on Jul 5, 2016 2:29:00 PM
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