The effectiveness of a ground based telescope is not only given by its light collecting area and the optical image quality, but also by the number of objects within the angular field of the telescope for which spectrophotometric informations can be collected simultaneously by the detector. This field-effectiveness can make a telescope of smaller aperture more efficient than a larger one. For stellar- and nebular spectroscopy there has to be done a compromise between the spectral resolution one likes to have and the light losses of the telescope-equipment combination.
Mitteilungen der Astronomischen Gesellschaft Hamburg
- Pub Date: