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Shelyak - Alpy 600 Base Module Spectrograph


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Regular Price: $849.00

Special Price: $749.00

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Manufactured by: Shelyak Instruments


SHELYAK INSTRUMENTS  Alpy 600 Spectrograph

Check out Jim Ferreira's article and photos with the Alpy 600 Spectrograph below:

Alpy 600 CCD mode
ALPY is a new modular product line for spectroscopy. ALPY allows the user to add components as desired with a separate spectrograph, guiding module and calibration module. It is multi-purpose (on a table, at a telescope; slit, slitless, optical fiber connector;  visual use, or with a CCD camera or DSLR...) and very easy to use with minimal adjustments to make. ALPY is an efficient system with a spectral domain from near-UV to near-IR with a resolution around 10A.


At left is the Alpy 600 in CCD camera configuration


The core element of the ALPY product line is the Alpy 600 spectrograph. With a 600gr/mm grism (grating + prism), the Alpy 600 offers compacity, low resolution (resolving power R~600), and dispersion compatible with current CCD cameras in astronomy. Focal ratio is f/5.  The
ALPY product line has been designed around standard mechanical threads  (M42x075, SM1, SM05) to facilitate the integration with your existing instrumentation.
ALPY product line also includes a separate guiding module (mirror slit 23µm) and a calibration module with neon/argon and tungsten lamps. ALPY offers a complete solution for astronomical spectroscopy.  Each ALPY module is independant, making ALPY unique and revolutionnary.
Progressive investment  
You have the choice of the module you want to get based on your budget and need. Upgrade your equipment over time through a sustainable investment. Discover slit based spectroscopy with the Alpy 600 base module which will bring you lot of possible observations on a workbench or at your telescope. Complete your investment with a guiding module to reach out fainter targets and utilize longer exposure time with your CCD camera. Then add a calibration module to get easier and more accurate wavelength calibration (neon/argon) and flats (tungsten).
Beyond modularity between the Alpy 600 spectrograph, guiding module and calibration module, the spectrograph itself is versatile and multi-purpose.
It's versatility allows interface with most CCD cameras with a standard M42x0.75mm thread. A C-mount adapter is available as well as a barlow lens element extending the backfocus and enlarging the spectrum, specially designed for Digital SLRs.
The removable standard slit includes multiple positions (25µm hole; 25µm, 50µm, 100µm or 300µm slits; 5µm tolerance) with a clear position (3mm hole) for a slitless mode.
A fiber connector mounting is also available making the Alpy 600 compatible with our optical fiber eShel solution.
Last but not least, the Alpy 600 is also a visual spectroscope (with or without slit) with an optional widening lens element. Watch for solar spectrum with Alpy 600 alone, or look for stars or nebulae spectra using Alpy 600 as an eyepiece on your telescope (diamètre 31.75mm).
Easy to use
Weight (<200gr, without camera), compacity and modularity makes Alpy 600 very easy to use. The  available guiding module is also very straight forward to use. There are very few adjustments to make.
ALPY product line benefits from Shelyak's experience and expertise in the area of astronomical spectroscopy.  For exemple, Alpy 600 optics have been specially designed for this spectrrograph, allowing an excellent quality spectrum through all the visible domain from near-UV  to near-IR (calcium triplet).
                       Alpy 600 Visual mode            
       Alpy 600 slit
             llustrations above show the Alpy 600 in (left) Visual Mode and (right) Slit Mode

Alpy 600 spectral images in quasi slitless (above) and narrow slit of 23µm using optional Alpy guiding module (below)

The ALPY product line benefits from our experience and expertise in the area of astronomical spectroscopy. For example, the Alpy 600 optics have been specially designed for this spectrograph, giving an excellent quality spectrum through all the visible domain from near-UV (Balmer serie, astonishing H&K lines) to near-IR (calcium triplet).

Lambda max is the wavelength at which the maximum fraction of light is absorbed by a solution. Lambda (λ) is a Greek letter that scientists use as the symbol for wavelength.

Lambda max is the wavelength at which the maximum fraction of light is absorbed by a solution(in this case by Alpy600). Lambda (λ) is a Greek letter, that scientists use as the symbol of wavelength.


Accesories Supplied:

multi-position non reflective slit: 25µm hole, 25µm/50µm/100µm/300µm slits, 3mm hole

  • spectrograph core with 600gr/mm grism, second order filter (cuts around 720nm and above) and collimator lens
  • M42x0.75 camera adapter with objective lens (focus adjustable for CCD back focus: 10.5-21mm)
  • 1.25inch telescope adapter
  • Alpy 600 mechanical body


Shelyak : Alpy 600 spectrograph - first spectra

Below are first spectra with the Alpy 600 using a Stellarvue SV80S APO and The Imaging Source DMK41 video camera, or, Atik ATK16 CCD camera.  Results with the DMK41 camera have been outstanding.  However, the Atik ATK16 CCD camera 8um pixels with the SV80S 480mm FL produces images that are considerably under-sampled.  The resulting spectra contain distorted continuum, primarily on the blue end - in part this is due to the slight curvature ('smile') of the 2D spectra produced by the grating-prism (grism).  The curved spectra traverses several horizontal rows of pixels, but because of under-sampling, the transition is in rough gradient steps.  It may be possible to reduce the under-sampling distortions by slightly defocusing the telescope to enlarge the star on the slit.  Some experimenting is in order.

I did not purchase the Alpy 600 with its guiding module (...eventually).  So far I have been able to center a bright star on the spectrograph slit, then carefully align the 80mm guide scope utilizing the cross-hair reticule function in the PHD guiding software and TIS DMK21 video camera.  Once the guide scope is aligned and locked in I can center fainter stars on the slit, then switch to guiding mode.  Still lots to try and learn.

So far the Alpy 600 is a winner.  Initial setup is pretty straight forward, and well explained in the introduction / instructions on the included CD.  From what I have seen so far, it is a VERY well thought out instrument, the results speak for themselves.

I purchased the Alpy 600 from Woodland Hills Telescopes @ telescope.net -- helpful, informative service.

Stellarvue SV80S f/6, 80mm guidescope, Losmandy GM8 mount

Flip-mirror, Alpy 600 spectrograph, Atik ATK16 CCD camera


The following are spectroscopy graphs of different stars using the Alpy 600 from Shelyak. The X Axis is the measurement of wavelengths (measured in Angstroms in this case) while the Y Axis represents the number of times the spectrograph instrument detected that wavelength. For example, take a look at the graph below of EZ Cma Wolf Rayet Star. Since these types of stars are losing mass extremely rapidy, these stars tend to have less hydrogen and more helium and nitrogen. In the case of EZ Cma, helium is abudant. If you would rather get the results in nanometers, simply divide the Angstroms number by 10. So therefore He II below would be at 656 nm.

Above, spectra of Wolf-Rayet star EZ Cma with Alpy 600 spectrograph using a SV80S and Atik ATK16 CCD camera. Below is a similar Wolf-Rayet star, WR141, recorded with a Star Analyzer SA100, 100 lines/mm grating, using same scope and camera.  The increase in spectral resolution is clearly apparent in the Alpy 600 spectra above.


Alpha Orionis "Betelgeuse", Alpy 600, SV80S, DMK41 video

Beta Auriga, Alpy 600, SV80S, DMK41 video

Spectra of Orion Nebula core next to Trapezium star groug, Alpy 600, SV80S, DMK41 video

Solar spectra, Alpy 600, SV80S, DMK41 video

Be star Zeta Tauri, Alpy 600, SV80S, DMK41 video














mc + MW

Additional Information

Name Shelyak - Alpy 600 Base Module Spectrograph
Manufacturer Shelyak Instruments
Model PF0035
Manufacturer Part No PF0035
Attachment various
Barlow Lens optional
Camera Adaptable T2 camera interface
CCD M42X0.75mm (C- mount adapter optional)
Focal Ratio f/5
Lo-Res Images resolving power R~600 @ 6563Å
Prisms grism (grating + prism) dispersive element
Spectral Response 3750Å - 7200Å
Telescope Interface as eyepiece (31.75mm dia.)
Use true spectrograph