Shelyak eShel Spectrograph

Shelyak eShel Spectrograph
Item # SL-PF0011
1 Questions(s)

Special Order

  • The Shelyak eShel is a cross-dispersed high resolution (R=10000) Echelle spectrograph designed by Christian Buil.
  • The objective is a Canon EOS 85 mm f/1.8 lens, making it easy to use a Canon EOS DSLR for color spectra images.
  • The eShel Spectrograph PF0011 comes with an R2 high performance grating and an FC connector for the 50µm optical fiber, which works great with today's larger telescopes.


Shelyak eShel Spectrograph Highlights

  • The Shelyak eShel Spectrograph is a cross-dispersed echelon spectrograph
  • f=125mm collimator (f/5)
  • R2 high efficiency echelle grating
  • coated prism cross-disperser
  • 85mm f/1.8 objective
  • Compact
  • High power of resolution R=10000
  • Visible domain (around 450-700nm)
  • Optimized for large telescope (50µm fiber)
  • KAF1603me chip based (size >13*9mm)
  • QSI 516ws or SBIG ST1603me camera recommended
  • Canon EOS lens interface with standard SLR backfocus

A Bit About Echelle Spectrographs

A spectrograph is an instrument which spreads out the light to analyze its source. The key component is a diffraction grating – a block of glass on which a high number of lines are engraved. An optical component is used to focus the resulting image on the sensor – in this case a CCD camera.

An Echelle spectrograph is a little bit more complex, but the basics are the same. The grating is used at high orders (typically 32 to 52). The result is a high dispersion spectrum, in which a lot of orders are mixed. Shelyak uses a second disperser (called a cross disperser) to separate the orders and then the complete spectrum is re-built. This method produces a high resolution and high bandwidth image, and you will be able to see dozens of horizontal and curved lines in that image. The spectrum can be read like a book, but instead of starting at the top you start at the bottom and read up, one line after the other, from left to right.

Additional Information

Additional Information

Manufacturer Shelyak
Spectrograph or Accessory? Spectrograph
Warranty 1 Year Warranty
Included Items

Included Items

  • eShel Spectrograph
  • R2 Grating
  • Canon EOS 85mm f/1.8 Lens
  • FC Connector for 50um optical fiber
Questions & Answers

Product Questions

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