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LUNT CaKMDs2 Ca-K Filter in Extension Tube
LUNT CaKMDs2 Ca-K Filter in Extension Tube

LUNT CaKMDs2 Ca-K Filter in Extension Tube

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Transforms normal refractor telescopes up to 1080mm focal length into Ca-K solar telescopes. No further accessories required.

  • Solar observation in Ca-K wavelength
  • For refractors up to 100mm aperture & up to 1080mm focal length
  • Bandwidth <2.4 Angstrom
  • Shows super granulation, flares & much more
  • Calcium-K filter module in straight extension tube
  • For use at 2 inch focusers
  • No additional accessories required
  • Absolutely safe, no danger to the eyes

Calcium-K module in straight extension tube, for using normal astronomical telescopes up to 100mm aperture and up to 1080/1620mm focal length as Ca-K solar telescopes.

This Calcium-K module transforms your normal astronomical refractor telescope into a Ca-K solar telescope. It will be very easy: Put the Ca-K module into the 2" focuser of your telescope, and you are ready for solar observing in the light of the Calcium-K wavelength.

Internal narrowband filters allow for a <2.4 Angstrom bandwidth. For refractor telescopes up to 100mm aperture and up to 1080/1620mm focal length. For imaging it will be better to use a bigger Ca-K module.
The Ca-K module is in a straight extension tube, for 2" focuser on the telescope side, and with T2 thread and 1.25" eyepiece connection on the eyepiece side.

All needed filter parts are integrated inside the compact module. There are no additional filters needed.

The Ca-K wavelength is at the edge of the visible light spectrum for human eyes, so for many people visual observing is difficult. However, all details could be captured photographically. Therefore the Ca-K Module is optimized primarily for imaging.


  • Bandwidth <2.4 Angstrom
  • Usable at telescopes up to 100mm aperture and 1620mm focal length
  • Straight extension tube housing
  • 2" slide tube for 2" focuser
  • Connection for 1.25" eyepieces
  • T2 thread for camera connection


  • Ca-K module in straight extension tube for 2" focuser
  • Integrated blocking filter B1200 for telescopes up to 1080/1620mm focal length
  • Instruction manual

Specifications: LUNT CaKMDs2 Ca-K Filter in Extension Tube

What's in the Box

What's in the Box: LUNT CaKMDs2 Ca-K Filter in Extension Tube

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