UVEX Spectroscope

5 389,20  incl. VAT - 4 491,00  excl. VAT

The UVEX is the most versatile instrument in our product range. Achromatic by design, it can explore far into the ultraviolet and infrared – at the very limits of what today’s cameras can achieve. The interchangeable grating allows different resolutions. Combined with its motorization module, it can be operated remotely.


Complete your spectroscope with the products below :

Additional modules

Additional modules: technical specifications

Description Shelyak ref. Acc. type Included Comment

Guiding module


Guiding module

To view the slit entrance during observation

Calibration module


Calibration module

For simple dark, calibration and flat images

Grating module

Grating module : technical specifications

Description Shelyak ref. Included

R @650 nm

Dispersion (nm/mm)

Blaze (nm)


Grating module UVEX 600t/mm




Grating module UVEX 150t/mm




Grating mocule UVEX 300t/mm




Grating mocule UVEX 1200t/mm





Grating mocule UVEX 1800t/mm




VIS (holographic)


Optical : technical specifications

Description Shelyak ref. Included

Material (% reflexion)

Mirror size

AR coating

Standard slit 23μm SE0140

Chromium (55%)

11 x 10 mm

400 – 700 nm

Comes with the guiding module

Standard slit 23μm SE0136

Nickel (not polished)

D = 15mm

Real (physical)l hole, no coating

Included with the UVEX

High performance slit 23µm SE0247

protected Aluminium (92%)

13 X 12,5 mm

350 – 800 nm

High performance thanks to its size, high-reflection coating and extended AR coating
Photométric slit 23/200µm SE0145

Chromium (55%)

11 x 10 mm

400 – 700 nm

Slit 35μm SE0150

Chromium (55%)

11 x 10 mm

400 – 700 nm

Slit 50μm SE0151

Chromium (55%)

11 x 10 mm

400 – 700 nm

Mirror slit 10μm SE0253

Chromium (55%)

12.2 x 13mm

400 – 700 nm

Very narrow slit for UVEX (for use with small-pixel CMOS cameras)

Recommended guiding cameras

Recommended cameras: technical specifications

Description Shelyak ref. Included

Acc. type




Caméra ZWO ASI 174 mini


Guiding camera

No The ‘standard’ guiding camera, suitable for most applications

Caméra QHY 174 M GPS


Guiding camera

yes Cooling allows long exposures (> 30s). Can be useful for observing very faint targets.

Recommended acquisition cameras

Recommended cameras: technical specifications

Description Shelyak ref. Included

Acc. type




Caméra ASI 533 MM Pro


Science camera


Other accessories

Other accessories: technical specifications

Description Shelyak ref. Included

Acc. type


UVEX Fiber Optics Connector Kit


To mount an optical fiber (FC connector) on the UVEX. For bench experiments, for example.

Atik ring adapter for the UVEX



To use an Atik camera

QHY camera adapter ring for UVEX



To use a QHY camera

Order filter 530 nm for UVEX


Order filter

The order filter is recommended for observations in the IR: it avoids order overlap (the second order of the blue part of the spectrum is superimposed on the first order of the IR).

Argon-Neon lamps


Spare lamps

Ar – Ne lamp

Spare lamp for flats


Spare lamps

Halogen lamp

Eypiece holder for the guiding


Eypiece holder for the UVEX It complements the guiding module and allows guiding by eye, rather than by camera. For 1,25″ eyepiece (not supplied).

All about the UVEX spectroscope :


The UVEX is a “crossed” Czerny-Turner spectroscope optimized for wavelengths from near UV (<350nm) to near IR (1µm).

We recommend using the ZWO ASI533 MM Pro camera with the UVEX spectrograph.

In this article you will find a lot of additional information about UVEX.

It is particularly suitable for Ritchey-Chretien (RC) telescopes up to 400mm in diameter (F/8).

Settings are precise and easily accessible:

  • A multi-turn knob adjusts the focus of the M2 internal mirror.
  • Use the index to set the central wavelength of the spectrum on the camera sensor. A vernier (available for each type of grating) allows you to position the grating precisely at the desired wavelength.

The uvex is supplied with a 600 tr/mm grating blazed at 500nm and an adapter ring for ZWO cameras (other rings for QHY and ATIK cameras are also available as options).

The UVEX spectroscope slit has 6 positions that can be easily changed using a Phillips screwdriver (supplied with the UVEX). Several slit widths are available: 25µm, 50µm, 100µm, 300µm, a 25µm hole and a 3mm hole. Other slits are available as an option and Alpy slits are compatible with UVEX.

A shockproof case is supplied with UVEX. It includes pre-cut slots for safely transporting the spectrograph with its camera, as well as various accessories (additional networks, order filter, tools, etc.).



  • Cross Czerny-Turner spectrograph optical design
  • Spectral range : 350 nm to 1µm
  • Spectral resolution with 600 l/mm grating R=1710 @ 650nm
  • Multi-position slit: 25µm, 50µm, 100µm, 300µm, 25µm hole and 3mm hole
  • Optimum telescope F/D ratio: F/8 (you can go up to F/5 without vignetting, but at the cost of a slight degradation in quality).
  • Compatible with ZWO, QHY et ATIK camera with a backfocus <14mm
  • Dimensions : 145 x 140 mm Height = 120mm
  • Weight : 1,2 Kg (without camera)
  • UVEX weight+ carrying case : 3,2 Kg


  • UVEX Spectroscope
  • A 600 gr/mm grating blazed at 500nm
  • A rigid case for safe transportation
  • A tool set
  • A bag of spare screws as well as 4 screws for fixing the autoguiding module on the UVEX.
  • An adapter ring for ZWO cameras
  • A plastic vernier for the 600 gr/mm grating.



Demetra UVEX V (September 2022)

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