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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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Optolong Filters

Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.

Optolong Filters

Astrodon Filters

Astrodon ExoPLanet LIght Curve Filters

Astrodon ExoPlanet Light Curve Filters

 

available filter sizes

Astrodon introduced the ExoPlanet-BB filter for use in amateur-scale telescopes to measure the light curves of exoplanets.

Although it may not seem possible at first, astronomers with typical backyard equipment and sensitive CCD cameras have the capability to quantitatively measure small changes in light intensity as large exoplanets pass in front of their suns.

​Based upon the extensive work of Bruce Gary in his book, "Exoplanet Observing for Amateurs", Chapter 7 concludes that a "clear with blue-blocking filter should be the amateur's default choice for exoplanets".

The Astrodon ExoPlanet-BB filter is that filter, where BB stands for "blue blocking". He concluded that this filter "has most of the high signal-to-noise advantages associated with unfiltered observing, yet it has most of the reduced systematics advantages associated with V-band and R-band observing.He recommended this filter for transiting exoplanets, or BTEs (those brighter than 10th magnitude assuming a telescope <16 inches in diameter). The rewards for using the CBB filter are that reference stars that are a different color from the target star won't produce annoying air mass curvatures in the light curve. Also, most moonlight is blocked by the CBB filter, leading to greater SNR. Finally, observations with the CBB filter exhibit lower atmospheric extinction. For an average star, the CCB filter will have a magnitude penalty of about 0.11 compared to a colorless (clear) filter.

The spectrum blocks UV and blue light. It starts transmitting light near 500 nm, corresponding to the shape of the conventional V-band filter and continues to transmit light into the near-infrared.

Bruce Gary also states that a "near-infrared filter should be used when observations at low elevations are necessary or when a nearly full moon is above the horizon". He specifically mentioned the Astrodon NIR Luminance filter which starts transmitting at 700 nm into the near-infrared.

The filter is 3 mm thick and is thus the same thickness as all Astrodon LRGB, narrowband, NIR and photometric filters for minimal refocusing. It has anti-reflective coatings on both sides. 

available filter sizes

  • 25mm unmounted
  • 1.25" mounted
  • 31mm mounted
  • 49.7mm unmounted
  • 49.7x49.7mm unmounted
  • 65x65mm unmounted
 

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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