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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.

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Astrodon Filters

Astrodon Narrowband filters set a new bar of performance and durability for imaging and research. The narrow 5 and 3 nm bandwidths enhance contrast of emission targets by lowering your background signal. 

Astrodon Filters

Optolong Filters

Optolong UBVRI photometrisches Filterset 2"

1. Photometric Filters 

"Historically our Solid-State Photometers used custom filters designed to transform well to the Johnson photometry standards with our detectors."

UBVRI filters are not for astrophotography. In fact, they are used to do photometry. So it’s in a more scientific application. In photometry, you measure the light coming from a star. By calibrating the data with reference stars, we’re able to get precise measurements on the flux coming out of a star. Combined with a measurement of the distance of the star (that is usually found by satellite to have precise measurements of far stars), we’re able to find fundamental parameters of the stars. Those fundamental parameters are usually the mass, the radius and the temperature of the star.

Main Use and Performance

UBVRcIc filters are not for astrophotography.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

Technical Data

  • Optical glass fine material
  • Spectrum: 300-1000nm
  • Surface Quality: 60/40 (Refer to MIL-O-13830)
  • Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over the both surfaces
  • High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm, SII 672nm and H-beta 486nm).
  • Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).

Optolong UBVRI photometric Filter Set - 2" mounted

Transmission Optolong UBVRI photometric Filter Set - 2" mounted

This filter set represents the Johnson-Cousins UBVRI photometric system, an extended version of the Johnson UBV system.
  • high transmission at pass-band (a bit lower for U)
  • quality glass substrate, quality finish (fine-optically polished), quality coating
  • comes with protective box for each filter

Each filter comes with a plastic case with high pressure EVA case lining.

Substrate: High-quality optical glass
Surface Treatment: Fine-optically polished
Surface Polish Quality: 60/40 (Refer to MIL-O-13830)
Surface Quality: 1/4 wavefront
Transmission: more than 70% for U, more than 90% for the other four pass-bands
Cell: 2" filter cell

Optolong UBVRI photometric Filter Set - 2" mounted

This photometric UBVRI filter set includes five 2" round mounted filters: ultraviolet (U), blue (B), visual (V), red (R), and infrared (I).

The Optolong 2" UBVRI Filter Set is made with quality brand glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. This filter set is designed to be used in filter wheels and filterholders that accept 2" round mounted filters.

Quality Filter Materials:
  • Quality brand substrate material from Germany, 1.85 mm thick
  • Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with ion-assisted deposition
Quality Finish
  • Filter substrate is fine-optically polished to 1/4 wave and <30 arc seconds deviation from parallelism over both surfaces.
  • Surface quality, according to MIL-O-13830, is 60/40
  • Optolong´s planetary rotation system is a homogenous and precise coating procedure that ensures both high transmission of pass-band and optical density of off-band
 optolong verpackung

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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