Cassegrain focus

Four different instruments are available to be mounted at the Cassegrain focus.

And the little dot next to it is us, at the Cassegrain focus of the mirror.

These are mounted at the f/11 Cassegrain focus.

Mounted at Cassegrain focus.

Mid-infrared camera and spectrometer with the ability to study cool interstellar dust, mounts on the Cassegrain focus.

Visitor instruments can use either the Cassegrain focus or one of the Nasmyth foci.

The instrument, which was located in a temperature-controlled room, was fed with optical fibers from the Cassegrain focus.

The mirror has a meniscus shape of 17 cm thickness with a central 1.2 m hole to accommodate the camera at the Cassegrain focus.

(The central hole in the primary mirror may still host a Cassegrain focus if the tertiary can be moved out of the way.)

Wide-field camera and spectrograph with the ability to take spectra of multiple objects simultaneously, mounts on the Cassegrain focus.

Telescope beside standard Cassegrain focus has also two Nasmyth focal stations for additional instrumentation, switched with a remote control.

The Cassegrain focus f/ratio is f/38 and the primary mirror f/ratio is 2.5.

The development of echelle spectrometers allowed high-resolution spectroscopy with a much more compact instrument, one which can sometimes be successfully mounted on the Cassegrain focus.

The telescope can be used with three different focal stations: wide field prime focus, coudé focus for high precision spectroscopy, or the intermediate cassegrain focus.

Observation using Nasmyth foci resumed on July 22, and Cassegrain focus resumed on August 26.

At CASSEGRAIN focus:

A spectrograph is fitted to the Cassegrain focus and an imaging CCD is attached to the Newtonian focus.

The spectrograph is fed from the Cassegrain focus through either one of two separate optical fiber sets, yielding two different spectral resolutions (HE and HR modes).

Oskar-Lühning Telescope, s Ritchey-Chretien with 1.20 m aperture diameter and a focal length of 15.60m in the Cassegrain focus.

There is also a secondary focal station, the f/15 Cassegrain focus, which possesses a 20 arcminute field of view and is the mount point for the IDS.

UKIRT has three Cassegrain instruments and a wide-field imager placed forward of the Cassegrain focus.

The Telescopio Carlos Sánchez is a 1.52 m Dall-Kirkham type infrared telescope with an equatorial mount and an f/13.8 Cassegrain focus.

In the future, when the Cassegrain focus of the telescope is commissioned, it is expected that CanariCam will move to this focus, which will provide superior performance with the instrument.

There will be a Cassegrain focus for the mid-infrared range, a Nasmyth focus for the near-infrared range and another Nasmyth focus for far-infrared.

The mirror of the 2.4 m Hiltner Telescope is aluminum coated Cer-Vit, and usable foci include f/7.5 and f/13.5 Cassegrain foci.