- Catadioptric telescope Cassegrain
Relay of 400 mm. diameter at F/6.5 (Larrosa)
- Apochromatic telescope of 120 mm. diameter at F/6.5 (Vixen)
- Catadioptric telescope Maksutov Cassegrain of 150 mm. diameter
at F/12.5 (Intes)
- Photographic lens 2.8/180 (Carl Zeiss)
- Camera CCD ST8XE with dual CCD for autoguiding (SBIG) only
on T400.
- Camera CCD ST4 only for autoguiding (SBIG) on any telescope.
- Camera CCD MX716 (Starlight Xpress) only used together with
the spectrograph.
- Camera SLR (Canon 350D) modified without IR filters, on
the R120 telescope or Carl Zeiss photographic lens.
The main telescope of 400 mm. is inside a dome on an equatorial
fork mount controlled from the computer room downstairs. The
120-mm apochromatic refractor and photographic lens of 2.8/180
are piggybacked to the main telescope.
Doing a comparison between some optical configurations we
will note the Cassegrain-Relay has a great advantage against
other configurations like Schmidt-Cassegrain, Newton or Ritchey-Cretien,
due to the following reasons:
- Quick focal ratio and small secondary obstruction (F/6.5
- 27%).
- The 96% of all visual spectrum from 400 to 700 nm, inside
de Airy disk.
- All optical surfaces are spherical so, easy to make and
easy to verify.
- Low sensibility to decentering / uncolimation.
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