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APM Professional Telescopes

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

Astronomy is our job

Observatory Telescopes

Big prime focus telescopes for private or public observatories including installation and full service.

Robotic / Remote

Robotic instruments for automatic imaging or telescopes for remote observation.

ZWO ASI120MM Guider

asi120mm mini camera autoguider 1000

The new ZWO ASI120MM Mini (mono) with its 3.75 µm pixels is a highly sensitive  autoguider for in a 1.25" body

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Product enquiries

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Please make your enquiries about the products you require here. We will contact you as soon as possible with a customised quote.

ZWO Cameras

asi533

Suitable for the spectrograph
ZWO MONO Astro Camera ASI 533MM-PRO cooled, Sensor D= 16 mm, 3.76 µm Pixel Size
Cooled USB 3.0 monochrome astro camera with powerful back-illuminated CMOS sensor for astrophotography in square format

 Cameras for Spectroscope UVEX & LISA (VIS)

UVEX Spectroscope

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

uvex01

We recommend using the ZWO ASI 533 MMPro 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.).

uvex02

In the Czerny-Turner set-up, the light enters through the entrance slit and is directed parallel onto the diffraction grating by the collimating mirror. There it is spectrally split and fed to the focussing mirror as parallel beams. This then images the beams, spectrally split onto the detector array. In principle, this represents a mapping of the input slit onto the array or the output slit, whereby spectral splitting also takes place in the parallel beam path using an optical grating.

The angles between the optical elements are used for the design of the spectrometer so that imaging errors can be reduced. If only one common mirror is used for both images, this is referred to as an Ebert set-up.

Crossed Czerny-Turner set-up (Illustration left)

The crossed Czerny-Turner set-up has a better beam path, i.e. a beam path with fewer aberrations towards the target. This crossed beam path also enables more compact spectrometers.

 

 

 

 

Optionale Grating Module

The UVEX can be used with additional 150 tr/mm, 300 tr/mm, 1200 tr/grating modulmm and 1800 tr/mm gratings, in addition to the 600 tr/mm grating supplied as standard with the UVEX.

Each grating is supplied with:

  • A grating holder (the grating is delivered mounted and adjusted on the grating holder)
  • A box for securely storing your grating on its holder
  • A cap
  • A plastic vernier corresponding to your gratinggrating modul

Grating UVEX 150 l/mm
Grating UVEX 300l/mm
Grating UVEX 1200 l/mm
Grating UVEX 1800 l/mm

Compatible with:

  • UVEX motorized
  • UVEX Spectroscope

UVEX can be used with a wide range of grids. The mesh can be changed in just a few seconds. Coding ensures that the mesh is correctly aligned. The grille holder is supplied with a protective cover.
The UVEX is supplied with a 600 Tr/mm grating blazed at 500 nm, giving a resolving power of R=1700 @ 650 nm. You can supplement your spectroscope with other gratings from 150 to 1800 rpm to achieve resolutions from R=400 to 7000 @ 650 nm.

The Alpy slots are directly compatible with UVEX. You can also use an optical fibre instead of the slit. An order filter can be fitted in the slit holder (to prevent order overlap in the near IR range).

Camera connection

uvex mit kamera

The UVEX can be used with various cameras.
The only restriction is that the camera has a maximum focus position of maximum focus position of 13 mm.

Cameras for Spectroscope UVEX & LISA (VIS)

 

uvex04

 

 

uvex on the telescopeSpecifications

  • 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

Composition

  • 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.

Connection diagram

uvex03

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

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