Brent, the danger is more from the exposed mirror on the typical large truss-tube Dob; the reflected hot spot isn't necessarily on-axis and can end-up just about anywhere. So perhaps a large scope isn't more dangerous just because of size, but they are more likely to be trussed and thus have an exposed primary. Brent Watson <brentjwatson@yahoo.com> wrote:
The forest is no more at risk from a large scope than from a small scope. It is pretty hard to get enough energy out of a scope and across a distance large enough to do any damage. The image, and the energy in the image, spread out very quickly and become a non-problem.
Brent
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