SKU: 20577750138

Lunt Calcium K Module

Sale price$402.75 Regular price$447.50
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Ships within 48 hours · Estimated delivery Sep 7 - Sep 12

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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

Read the latest news about the Sun from NASA.

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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SKU: 20577750138

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4.5 ★★★★★
Based on 27 reviews
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Verified Purchase
Mark Halpin
Massapequa, US
★★★★★ 5
Quality
Works very well, I also have the 11 in 1 green mac mini m4 docking hub with s 1Tb external drive installed. So f a r I'm impressed we with the quality of green products and their competitive pricing. Will be purchasing green cables in the near future. Ugreen has become my new go to company for accessories.
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Reviewed in the United States on May 18, 2026
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Verified Purchase
Gabriel L. De Mattos
New York, US
★★★★★ 5
One cable does it all, rock solid Ethernet and great 4K output
This hub has simplified my desk setup considerably. I plug it into my MacBook and instantly have Ethernet, 4K HDMI, two USB-A ports, and 100W charging all from one connection. The Ethernet is Gigabit and the speeds are as fast as plugging directly into the router. The 4K HDMI output to my monitor is clean with no flickering. It runs slightly warm during extended use but nothing alarming. Build quality feels solid and UGREEN has been consistently reliable in my experience. Worth every penny if you need to expand a USB-C only laptop.
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Reviewed in the United States on May 5, 2026
R
Verified Purchase
Ruckus
Boise, US
★★★★★ 4
Nothing Special
Works as intended. I bought it mostly for the Ethernet adapter which was plug and play with the latest installation of Fedora Linux and uses an AX88179 Gigabit Ethernet chipset. The Ethernet portion does not have activity lights. A bit of a lazy omission. Port locations are smartly placed with the HDMI output and power input at the back facing one direction, and the Type A USB peripheral ports facing the other. This is great for cable routing. The single Type C port is only for power delivery. It will not work for data to connect other peripherals.
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Reviewed in the United States on June 5, 2026
A
Verified Purchase
Ana Lucia Gonzalez
Battle Creek, US
★★★★★ 5
UGREEN
Very useful and compact USB-C hub. It easily expands connectivity with HDMI, USB ports, and fast charging support. The 4K HDMI output works well for presentations and streaming, and the 100W power delivery keeps devices charged without issues. Build quality feels solid, and it’s perfect for travel or daily use. Great value for the price.
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Reviewed in the United States on April 11, 2026
C
Verified Purchase
ChrisJE
Whiting, US
★★★★★ 5
Compact and useful.
It's small and light enough to fit in my bag easily. My computer uses a USB-c charger, and there's only one port, but I was able to use it for ethernet, and pass the charging through the same port. I've had issues with my computer not recognizing charging from some sources before, so this was great.
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Reviewed in the United States on May 28, 2026

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