SKU: 20577750138

Lunt Calcium K Module

Sale price$402.75 Regular price$447.50
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Description

Lunt Calcium K ModuleCalcium K Module Calcium K (Ca K) telescopes and filters are used to study the wavelength of 393. 4 nm. This emission line is one of two that are produced by Calcium just at the edge of the visible spectrum. Comparatively, this is in a layer that is slightly lower and cooler than the layer viewed in Hydrogen alpha. The emission line displays areas of super granulation cells that are brightest and strongest in areas of high magnetic fields, such as

Calcium K Module

Calcium K (Ca-K) telescopes and filters are used to study the wavelength of 393.4 nm. This emission line is one of two that are produced by Calcium just at the edge of the visible spectrum. Comparatively, this is in a layer that is slightly lower and cooler than the layer viewed in Hydrogen-alpha. The emission line displays areas of super granulation cells that are brightest and strongest in areas of high magnetic fields, such as sunspot activity and active regions. Having the ability to study the Calcium K and the Hydrogen-alpha line provides important insights into the structure, strength, and depth of these active regions. Lunt Solar Systems Calcium K modules can be used with most standard night time refractors, or with Lunt's new Modular Telescopes in their night time configuration!

The Calcium K modules line is centered at 393.4 nm. This wavelength is considered to be slightly outside the visible spectrum on the UV side. While most people can visually see the violet color of the wavelength, many cannot resolve the contrast due to yellowing of the cornea. People who have had cataract surgery are often able to see considerable detail. But, it is for these reasons that the Ca-K line is typically studied via the use of cameras, which are able to provide stunning details.

Internal narrowband filters allow for a <2.4 Angstrom bandpass. This is primarily an imaging system due to the difficulty of many to visually see everything that CaK has to offer.

Choose the best Calcium K Module for your Telescope Size and Focal Length:

B600: For telescopes up to 100 mm aperture and 600 mm focal length

B1200: For telescopes up to 100 mm aperture and 1200 mm focal length

B1800: For telescopes up to 100 mm aperture and 1800 mm focal length

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SKU: 20577750138

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4.9 ★★★★★
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DR
Lowell, US
★★★★★ 5
Great kids' shoe — easy on, comfy all day
Size: 3 Little Kid, Color: Pink/Lavender
My kid has been wearing these for a few weeks now and I'm genuinely impressed with how well they've held up. The knit mesh upper keeps feet cool and comfortable during long days at school and outdoor play, and the cushioned EVA midsole does a great job absorbing impact. What really won me over is the slip-on design with elasticated laces and dual pull tabs — my child can put them on and take them off completely independently, which is a huge win. The fit is snug but not tight, and they run a bit roomy in width, which is great for kids with wider feet or those who need a little growing room. At $32, the quality feels solid for the price. Lightweight, breathable, and easy to wear — these check all the boxes for an everyday kids' shoe.
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Reviewed in the United States on May 23, 2026
M
Melissa
New York, US
★★★★★ 5
Cute, Comfortable, Light-Weight Shoes, Perfect for School
Size: 11 Little Kid, Color: Pink/Lavender, Size: 11 Little Kid, Color: Pink/Lavender
These have turned out to be great everyday shoes for my 5 year old. She normally wears a size 10, but since that size wasn’t available, I ordered the 11 expecting her to grow into them. I was pleasantly surprised that they already fit her pretty well. There’s still a little extra room in the toe area, but the shoes fit securely around her ankles so they don’t feel loose or slip off while walking or playing. She says they’re very comfortable and loves how easy they are to slip on by herself. The lightweight design is nice for everyday wear, and they’ve held up well so far despite being worn almost daily. They've become her favorite shoes to wear! Also the pink/lavender color is really pretty in person. Overall, I’m very happy with them and would order again.
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Reviewed in the United States on May 13, 2026
A
Amazon customer
Lowell, US
★★★★★ 5
Great shoe well made
Size: 13 Little Kid, Color: Pink/Lavender, Size: 13 Little Kid, Color: Pink/Lavender
Really good shoes at a fair price. My daughter loves the pink and purple gradient colors. Really beautiful. Shoes have proven themselves very durable. She's been wearing these a few times a week for the last couple months and they still look new aside from some dirt stains. Fit perfectly. Very comfortable. This is always her first pick in the morning when she's getting dressed. Good breathability you can wear these in hot summer weather without sweaty feet. Versatile shoe looks good enough to wear out and about or exercise in.
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Reviewed in the United States on May 16, 2026
K
Verified Purchase
Kevin Keegan
Belleville, US
★★★★★ 3
Runs large
Size: 7 Big Kid, Color: White
Runs very large.
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Reviewed in the United States on June 5, 2026
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Verified Purchase
Lou
Port Orchard, US
★★★★★ 5
a little roomy for narrow feet.
Size: 6 Big Kid, Color: Black/Black
Nice shoes. My little one has narrow feet so they are a little lose. Overall, a nice shoe.
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Reviewed in the United States on June 4, 2026

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