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PLEASE BE INFORMED DUE TO COVID19 OUR DELIVERY MAY TAKE LONGER THAN USUAL. THANK YOU FOR YOUR UNDERSTANDING!
DUE TO COVID19 OUR DELIVERY MAY TAKE LONGER THAN USUAL. THANK YOU FOR YOUR UNDERSTANDING!

Lunt Calcium K Module with B1200 Filter and 2" Straight-Through Tube

$1,538.60

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. This is easily accomplished in seconds by switching from your H-Alpha filter to your Calcium K modules.

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
B3400: For telescopes up to 100 mm aperture and 3400 mm focal length

Note: pictured are the B1800 diagonal and straight-through version

Free Shipping Everyday to Canada!
(Except to Yukon, Northwest Territories, Nunavut, and other areas deemed as "remote" by Canada Post or Purolator)
On orders above $100

Orders are processed: Monday – Friday from 8am – 3:30pm MT

(Public Holidays Excluded)

Order Confirmation: After placing an order, you will receive an order confirmation by e-mail. This means we’ve received your order in our system and have pre-authorized your credit card for the purchase. If your item is back-ordered or otherwise unavailable, we will void the pre-authorization charge and contact you to inform you by e-mail. If your item(s) are available for immediate shipment (within 7 business days unless noted longer on the product page), we will process the charges and submit the order for shipment.

Tracking Numbers will be sent to your email once your order has shipped.

In some cases, we may need to contact you before your order can be shipped. To ensure there is no delay, please respond to any email/phone call from our Customer Service team.

We proudly use the following Shipping Methods and will choose the best available in terms of price and delivery times at the time of shipment.

Price Guarantee Policy:

We want to ensure our customers get the products they need at the best possible price. If you find another online store that offers a lower price than us within one month of your purchase date, please let us know and we will refund your original payment for the difference. 

To request your partial refund simply e-mail us a link to the same product on our competitors website within one month from the date of your order and we will process the credit accordingly.

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  • You must purchase the item from our website before requesting your Price Match Guarantee
  • Promotions such as rebates and buy one, get one free offers are not eligible
  • The item must be in stock on the competitors website
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  • The Price Match Guarantee includes the item price and the shipping charges, it excludes sales tax