Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)

Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)

Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)

B&H # LU18BF2ST2TL MFR # LS18CAKMDS
Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)

Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)

Show MoreLess

Close

Now Viewing:

Discontinued

Product Highlights

  • Highlights Sunspots and Active Areas
  • 18mm Aperture Filter
  • Straight Tube Configuration
  • For up to 100mm Aperture OTAs
  • Fits 2" Focusers
  • Accepts 1.25" Eyepieces and Accessories
  • Use with 1800mm Focal Length OTAs
Show moreShow less
  • 1Description

Specifically engineered for the 393.4nm wavelength, Lunt Solar Systems' 18mm Calcium-K Solar Eyepiece Filter is primarily used to more clearly resolve sunspots and active areas of the Sun. This wavelength is slightly outside the visible spectrum on the ultraviolet side and highlights areas that are slightly lower and cooler than the layer viewed using hydrogen-alpha filters, so this Ca-K filter makes an ideal companion accessory to give observers a more diverse viewing experience. The straight tube viewing configuration fits into 2" focusers, and accepts any user-supplied 1.25" eyepieces and accessories while providing a blocking 18mm aperture. This model is recommended for use with optical tube assemblies (OTAs) with a focal length of up to 1800mm.

In the Box
Lunt Solar Systems 18mm Calcium-K Solar Eyepiece Filter (18mm Blocking, 2" Straight)
  • Limited Five-Year Warranty
  • Table of Contents
    • 1Description
    Type Calcium-K
    18mm aperture
    Size Barrel: 2"
    Eyepiece holder: 1.25"
    Application Solar observation
    393.4 nm wavelength light
    Be the first to review this item
    See any errors on this page? Let us know.