Shelyak Alpy Spectrograph

ALPY is a new modular product line for spectroscopy.

ALPY allows progressive investment with separate spectrograph, guiding and calibration modules. It is multi-purpose (on a bench or with a telescope; slit, slitless or with an optical fiber connector; visual use, with CCD camera or digital SLR...) and very easy to use with minimum adjustements to make.

ALPY is an efficient system with, for the Alpy 600, a spectral domain from near-UV to near-IR with a resolution around 10A.

The core element of the ALPY product line is the Alpy 600 spectrograph. With a 600gr/mm grism (grating + prism), Alpy 600 offers compactness, low resolution (resolving power R~600) and a dispersion compatible with the current CCD cameras used in astronomy.

The spectrograph is F/5.

The ALPY product line has been designed around standard mechanical threads (M42x075, SM1, SM05) to facilitate integration with your existing instrumentation.

The ALPY product line also includes a separate guiding module (mirror slit 23m) and a calibration module with neon/argon and tungsten lamps. These make it a complete solution for astronomical spectroscopy, but each module is independent, making ALPY unique and revolutionary.

Progressive investment (" la carte")

You have the choice of which module to purchase based on your budget and need. You can then upgrade your equipment over time through further investment. Discover slit based spectroscopy with the Alpy 600 base module which will bring you a lot of possible observation on a workbench or at your telescope. Complete your investment with a guiding module, allowing longer exposures with your CCD camera to reach fainter targets. Then add a calibration module to get easier and more accurate wavelength calibration (neon/argon) and flats (tungsten).


Beyond the modularity between the Alpy 600 spectrograph and guiding and calibration modules, the spectrograph itself is versatile and multi-purpose.

It is able to interface with most CCD cameras with a standard M42x0.75mm thread. A C-mount adapter is available as well as a barlow lens element specially designed for Digital SLRs, extending the backfocus and enlarging the spectrum.

The removable standard slit includes multiple positions (25m hole; 25m, 50m, 100m or 300m slits; 5m tolerance) with a clear position (3mm hole) for a slitless mode.

A "fiber connector" mounting is also available so Alpy 600 is compatible with our optical fiber eShel solution.

Last but not least, Alpy 600 is also a visual spectroscope (with or without slit) with an optional widening lens element. View lamps or the solar spectrum with Alpy 600 alone, look for the spectra of stars or nebulae spectra using the Alpy 600 as an eyepiece on your telescope (diameter 31.75mm).

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).

Sheklyak Eshel

Eshel is your complete and fully operational spectroscopy solution specially designed for astronomy. This unique and highly performing instrument will allow you to productively run your spectroscopic observations.

* F/6 - 50m - fibre injection & guiding unit
* object optical fibre 50m, protected by inox
* echelle spectrograph F/5; R >10000
* calibration unit controled by computer
* calibration fibre 200m, protected by inox
* software module for AudeLA (Tcl/Tk)

We designed the spectrograph with Christian Buil, a higly recognized optician expert. The software module has been written by Michel Pujol, an expert in Tcl/Tk and AudeLA platform. They both complement our expertise to bring you the best solution in echelle spectroscopy for astronomy!

Choice of optical fibre has been made to increase radial velocities measurement accuracy and for a better confort in using the eShel.

The complete solution is made of four major modules:

Fiber Injection & Guiding Unit
* M42 T-adapter telescope interface
* Backfocus 43mm
* Miror with light going through a 50m hole for the f/6 standard version (a 75m f/9 version exists - contact us for details)
* Calibration fiber input (remote controlled mirror position)
* Fibre optics
o 50m object fiber
o 200m calibration fiber
o fibers protected by metal/plastic casing
o FC fiber connectors
* Guiding camera (C-mount; video Watec 120N+ recommended)

Calibration Unit
* Thorium-Argon lamp with high voltage power supply for precise calibration
* Flat lamp for echelle order geometry and blaze processing
* Electronic to control remotely calibration frame acquisition

echelle spectrograph
* Cross-dispersed echelle spectrograph
o f=125mm collimator (f/5)
o R2 high efficiency echelle grating
o coated prism cross-disperser
o 85mm f/1.8 objective
* Compact
* High power of resolution R=10000
* Visible domain (around 450-700nm)
* Optimized for large telescope (50m fiber)
* Choice of imaging camera
o KAF1603me chip based (size >13*9mm)
o QSI 516ws or SBIG ST1603me camera recommended
o Canon EOS lens interface with standard SLR backfocus
eShel Software
* Easy to use
* Open source, based on AudeLA platform and Tcl/Tk language
* work on MS Windows platform
* multi-language support
* Remote-controlled operations
* Automatic spectra reduction procedure after acquisition
* FITS file support with multiple HDU
* Export individual orders or merged spectrum
* Download here an exemple of a processed echelle spectrum of our Sun (open with multi-HDU FITS reader such as fitsview).

Shelyak LHires Accessories

Accessories for LHires III Spectrograph


Shelyak Eshel Complete System

Complete optical fibre fed echelle spectroscope for astronomy:
-echelle spectroscope R>10000 (including 85mm f/1.8 lens)
-Fibre Injection & Guiding Unit F/6
-Object fibre 50m, 20m length
-Calibration fibre 200m, 20m length
-Thorium-Argon calibration unit
-cables and power supplies for standard european main supply (220V). To be adapted for other networks.

Shelyak LISA Spectrograph

Explore to the limit of your telescope with our LISA low resolution high luminosity spectrograph. With its slit, LISA is specially designed for faint or extended objects.

It is an educational tool for student to quickly record spectra of stars and nebulae and focus on actual project rather than long observing hours.

It is also a scientifical tool to study faint objects (novae, variable stars, comets, asteroids, nebulae, galaxies, quasars...), to monitor group of stars, to analyse chemicaly planets in visible or near infra-red domain

Model with slit (15/19/23/35m)
-Visible spectral domain (400-700nm)
-Telescope interface M42/2-inch

* Slit 50/75/100m with 19m hole
* Automatic Calibration module
* Guiding camera (kit Watec 120N+ recommanded)
* Acquisition camera (QSI583ws recommanded

Technical Specs:

LISA specifications
* Collimator F=130mm F/5
* Custom objective F=88mm F/2.4
* Power of resolution R ~600-1000
* Available for Visible (400-700nm) or near Infra-Red (650nm-1m)
* Slit 15/19/23/35m
* Weight: 1.4kg
* Telescope interface M42 (T-standard), 41mm backfocus


Shelyak Lhires Lite Spectrograph

The Lhires Lite spectroscope is based on Shelyaks own experience in scientifical animation. It has been specifically designed to be easy to use, robust, and without danger. It attaches directly on a photographic tripod (Kodak standard).

Lhires Lite is specially well adapted for the public. Show them the solar spectrum at his best: thousands lines are visible!

Show your public the solar spectrum like they have never seen. Sodium doublet is well split with forest of lines everywhere. Explain how the professional astronomers use the same technic to measure stellar composition, temperature, pressure...

A leaflet is provided with the Lhires Lite; it does provide some ideas of projects to conduct with this spectroscope

Some lines are identified and zoom around Sodium & Magnesium lines allow to better check those areas.

Lhires Lite slit is manufactured by Shelyak. It is a center piece for the quality of the spectrum obtained with the spectroscope.

Includes adjustable eyepiece holder

Everyone's eyes are not the same. This is why we are including an adjustable eyepiece with the Lhires Lite spectroscope. It is easy to use and well adapted for children.

The Lhires Lite spectroscope includes several scale's you can use to help identifying the lines either in the solar spectrum or spectral lamp. You can also create your own or use a blank paper for the students to draw the spectrum they see and compare with reference scales.

Includes handling case

Spectroscope is shipped in a quality handling case, including customed foam.


Shelyak Lhires III Spectrograph

This high resolution spectrograph allows the observor to visually watch the solar spectra with a lot of fine details. This is an ideal instrument for clubs and associations who organize astronomy days for the public

Lhires III spectrograph has been designed for small telescope (typically 8" f/10 telescope) and is then perfectly adapted for backyard astronomy. It can be setup in numerous instruments and you can use several type of CCD camera, webcam, or SLR cameras to record your own spectra.

But Lhires III is also a perfect tool for studying the sky. Students from several universities are learning from this spectrograph. Its design is powerful but simple and one can easily open it to see inside. Assembling the spectrograph is also very educational. Easy to use, it allows practical astrophysic on small telescopes.

Lhires III can be used visually, which makes it a great educational tool during astronomy days and public observing sessions. Without a telescope, it enables the observor to watch, safely, solar spectra in very high resolution.

With a video camera or a webcam and a small instrument, Lhires III becomes a spectro-heliograph. One can then image the Sun in multiple wavelength (Ha, HeI, K...) using a scanning technique.

Lots of educational projects around the Doppler effect can be done such as::

Jupiter or Saturn rotation
Radial velocity of stars
Star rotation: v.sin(i)
Spectroscopic binaries

Easy to use
With the mirror slit, the Lhires III is very easy to use and allow to center and maintain the target into the slit with great precision. A simple webcam allow to guide on bright star. You get the full control of the operation during the exposure and you do not need a state of the art mount to do spectrography!

A multi usage instrument
Almost all CCD cameras, SLR cameras, or simple webcam can be mounted on a Lhires III.

Very convenient: optional grating and support are available to adapt in few seconds your resolution to your project. Fainter objects are accessibles: novae, bright comets... See our performance page

Technical Specs:

Performance Specifications
Lhires III is shipped with a 2400 lines/mm grating. Other gratings are available in option. They are shipped with their support and protective metal & plastic boxes. Those gratings modules allow to adapt your spectrograph resolution to your project.

The Lhires III comes with the following
Lhires III comes with a Schmidt Cassegrain Telescope adapter. We also have 2" adapter if you need.

The spectrograph also comes with a standard T thread that allow you to mount any SLR with a standard T-ring. It also comes with an eyepiece holder.

Short FAQ (Frequently Asked Questions)
Q: Do I have to select an optional grating when I order?

A: This is optional. The spectrograph provided is fully functional and includes a 2400 lines/mm grating with support. Optional gratings are made available to reach additional projects that require lower resolution.