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Baader Calcium K-Line Filter - 1.25" # CaK 2458355
| Brand | Baader Planetarium |
| Part Number | 2458355 |
| Availability | available |
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Product Info
Manufacturer Description
Please note: The Baader Ca K-Line filter is intended for imaging ONLY. It is not suitable for visual observation since the high UV levels can be an eye safety risk from prolonged observations. The CaK filter must be used in conjunction with a primary solar filter such as a Herschel Wedge Prism, or Baader AstroSolar Film (provided). The CaK filter must be placed after the primary filter (i.e. on the eyepiece), and cannot be used alone, or permanent eye and equipment damage will result. Also, due to the eye's low sensitivity and very poor resolving ability at 395nm, solar features in CaK are generally invisible for most observers.
The Baader Planetarium Double Stacked Calcium K-Line Filter makes imaging of the sun in the Calcium (Ca II) K-Line accessible to anyone with a telescope and digital camera or webcam. This double-stacked filter uses sophisticated coatings to produce a sharp 8 nanometer (nm) wide bandpass, centered at 395nm. This bandpass provides significant contrast for high-resolution imaging of granulation, flares, sunspots, and other features that are prominent in CaK light. The Baader K-Line filter works with your existing telescope eliminating the need to purchase a dedicated CaK telescope or expensive CaK modules - at a small fraction of the cost. The Baader CaK may be used with virtually any telescope, of any aperture - Newtonian, SCT, refractor, etc.
The Baader Double Stacked Ca K-Line Filter is enclosed in a standard 1.25" thread-on eyepiece cell. It can be attached to an eyepiece for projection imaging, or directly to a camera's nosepiece for prime-focus. The filter must be used with a solar pre-filter to reduce the heat energy that reaches the filter. A 200mm x 290mm (8x11inch) sheet of Baader's renowned AstroSolar Photo Film (ND=3.8) is provided with each Ca K-Line filter. This material may be easily mounted to any telescope using provided instructions.
The Baader Herschel Safety Wedge Solar Prism may also be used as the energy rejection filter in place of the AstroSolar Photo Film. This will provide the absolute highest quality solar images possible in CaK with the absolute least risk to eye or equipment damage.
As with all Baader Planetarium filters, the Solar Continuum possesses all of the trademark Baader filter qualities. Optical, physical, and mechanical qualities are superb.
Agena Note: Please note that this filter does not feature a female thread. Hence, you cannot stack additional 1.25" filters on to this item.
Reviews
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Avani Soares Well-Known Member
- Skill Level
- Unknown
- Time with Product
- Unknown
- User Notes:
- Review by Soares A.
Dec 29, 2016Excellent product. Complying with the
Pros: Cons: Comments:Excellent product. Complying with the technical characteristics. I am using it to protect the filter DayStar H-Line from IR with a lens of 80mm. For the 150 mm lens would add a Herschel wedge.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Feb 20, 2015Baader CaK Filter
Pros:Quality Lenses,Lightweight
Cons:Expensive,Extra Safety Precautions
Comments:I use this filter with Baader ND 3.8 solar film.
Bottom Line: Would you recommend this item? No
NOT FOR VISUAL USE with eye alone. I focus and observe the CaK sun image on the camera live view screen ONLY. Pictures show faculae in more detail than my regular white light sun pictures.
Baader film or other sun filter MUST be used with this filter.This review was provided courtesy of AgenaAstro.com
Feb 17, 2015Baader Calcium K-Line near UV filter
Pros:Compact,Accurate,Lightweight,Quality Lenses,Strong Construction
Cons:Difficult to Use,Works Better In Bw Photo
Comments:The filter is for de advertised bandpass. It is difficult to be used in color photography, but if you take b/w photos it works as advertised.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Mar 26, 2013The best Calcium K-Line 393nm filter
Pros:Two Filters In One,Highest Optical Standards,Hand Selected Substrate,German Manufactured,393nm,Compatible With U-filter,Hard Coated,Highest Transmission,Precision Control
Cons:Unsafe For Eyesight,Pricey,2inch Unavailable,No Female Thread
Comments:I am an experienced solar imager, and this is by far the best possible investment any amateur telescope owner can make.
Bottom Line: Would you recommend this item? Yes
If you have ever wanted to photograph solar flares, solar prominences, solar filament eruptions, and ellerman bombs, then this is the hidden review you have been looking for.
The heart of any solar telescope relies on filter performance. Baader Planetarium brand optical filters use ion-beam technology, which provide superior , multilayer hard sputtered coatings on a single piece of HAND SELECTED substrate.
The K-line filter, consist's of a substrate pair. Stacked glass is retained at a slight angle by a precision milled tilted seperator. Because of the precise seperation, and superior polishing standards, there are no newton rings, and no noticeable reflections.
The top filter in the stack, is a 395 bandpass consistent with a halfwave modulation of 10nm.
The bottom filter, is centered at 393nm with a very sharp peak, and is what makes the baader planetarium k-line filter superior to all the rest. It is literally the only 393nm filter amateurs can aquire from the market, with out placing a custom bulk order.
When combined, the top and bottom total filter performance is just 8nm wide. This number is strictly controlled by the best quality management possible so that the typical filter performance will match every time.
This filter includes Baader Planetarium astrosolar film, regarded as the highest quality solar filter available.
However, light limiting factors of any neutral density filter destroys the ability to photograph solar prominences.
To counteract the destructive nature solarfilm has on narrowband solar surface details, baader planetarium offers a secondary filter, which amateur's may use inplace of astrosolar film.
The baader planetarium U-filter is designed to act as an ultraviolet pass filter that is fully blocked in both visual light wavelengths, infrared, and most importantly a very steep cutoff near 395. The U-filter also has very high transmission at 393nm, which provides extreme enhancing ability on the performance of a baader planetarium k-line 393 filter.
When combined, a baader planetarium U-filter with the K-line filter provides extreme narrowband rejection capability, which enables the stunning view of solar prominences. You can trim the bandwidth of the filter combination down even further by adding additional filter elements such as a herschel wedge prism, or a GG395 absorption filter.
Be absolutley certain to use additional infrared/ultraviolet cut filters infront of all baader planetarium filters. This is the only way to guarnatee the long life of the filter coating.
ULTRAVIOLET FILTERS ARE FOR PHOTOGRAPHIC USE ONLY
PLEASE ALWAYS REMEMBER THIS, AND NEVER SACRIFICE HUMAN EYESIGHT EVEN FOR 1 SECOND TO THE POWER OF INTENSE SOLAR RADIATION.This review was provided courtesy of AgenaAstro.com
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Manufacturer Baader Planetarium
