Hidrogén-alfa naptávcső továbbfejlesztése fókusznyújtással, a Nap nagyfelbontású fotózása

Abstract

The Sun observing is a special experience for amateur astronomers, becuse a real star can be studied on a cosmic scale almost up close. Most of the currently commercially available solar telescopes show the image of the Sun in the hydrogen alpha line in an extremely narrow bandwidth. The most important element of the hydrogen alpha solar telescope is the very precisely constructed tunable Fabry-Perot interferometer. The narrow bandwidth of the interferometer (0.7-0.5 Angstrom) provides an extremely detailed image that almost seems three-dimensional. Since the price of the interferometer filter increases with the diameter, the resolution of the telescope is higher with a larger diameter, so the solution is widespread to install a smaller diameter, and therefore cheaper filter, in a simple, inexpensive telescope with a larger lens diameter. Another option to increase the resolution, is focus extension. Since the size of the image formed at the primary focus is proportional to the focal length, it is worth installing a negative lens element in the telescope at an appropriate location. With this solution, when taking photos, a larger and higher-resolution image appears on the astrocamera sensor, so the resulting photo will be more detailed in proportion to the focus extension.