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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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Chroma Ha, OIII and SII Filter with 5nm & 3nm F/3

 

mega chroma individual filters

Chroma Narrowband Filters Ha, OIII and SII Filtersets with 5nm & 3nm F/3  optimised Bandwidth

These nebula filters from Chroma offer extreme contrast. Thus, the astrophotographer achieves a very good result even with considerable stray light from cities or from the moon. The high transmission is given up to a focal ratio of f/4.


The quality features of these narrow band filters

  • High light transmission and narrow bandwidth to maximise contrast
  • Use in light sensitive areas and dark locations
  • Extends exposure time under moonlight conditions
  • These narrow-band filters can be used up to f/4 with virtually no loss of signal.
  • Blackened edges to prevent internal stray light reflections
  • Consistent 3.0mm filter thickness ensures parfocality

H-Alpha Filters 5nm

H-alpha filters can only be used photographically, but objects emit about three times as much at this wavelength as they do at H-beta. H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).

hos TabelleOIII Filters 5nm

Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae

SII-Filters 5nm

SII filters isolate the spectral emission of singly ionized sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).

 

Chroma hos

Chroma hosOD

All transmission and blocking (OD) data are actual, measured spectra of representative production lots. Spectra varies slightly from lot to lot. Optical density values in excess of 6 may appear noisy because such evaluations push the resolution limit of low light level measurements.

Alternatively

Ha OIII SII -3nm -F/3

Chroma hos33

Chroma hosOD33

All transmission and blocking (OD) data are actual, measured spectra of representative production lots. Spectra varies slightly from lot to lot. Optical density values in excess of 6 may appear noisy because such evaluations push the resolution limit of low light level measurements.

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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