By Burnham R.
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Additional resources for Burnham's Celestial Handbook: An Observer's Guide to the Universe beyond the Solar System, V
An aluminized spot on the back side of the meniscus corrector often serves as the secondary mirror of the Refracting Telescopes Observing the White Light Sun telescope. In most designs, the Mak secondary mirror is smaller than the secondary found on an identically sized SCT, resulting in views with slightly improved contrast. This feature makes the Mak a slightly better choice for solar observing. As with the SCT, portability is a distinct advantage. The relatively thick correcting lens (more than 12 mm) creates weight considerations plus the added expense of producing a large optic.
Still, it is wise to consider the materials that have been used in the construction of your telescope. If a plastic drawtube or light baffles are used (as in some newer instruments), there exists a danger that heat from the Sun might damage those components. Older and high-end telescopes are usually of all metal construction and would be risk free. We recommend thoroughly inspecting any telescope before attempting solar projection, to determine if the components in the light path are combustible.
It is these low-level convection thermals we try to understand and control when we are trying to reduce the poor seeing conditions associated with solar observing. So, what does a solar observer do to combat poor daytime seeing conditions? First, evaluate your observing site. Do buildings sit beneath or near the path that light from the Sun must take in reaching your telescope? If so, relocate and avoid that situation. If possible, locate the observing site in a place where the prevailing winds are not blocked.
Burnham's Celestial Handbook: An Observer's Guide to the Universe beyond the Solar System, V by Burnham R.