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Hi,
Dave, I am using that program, Newt for windows. thanks.
what i wanted to know is how is the optimal distance from the primary determined. is it based on the diameter of the light cone that would hit the secondary and would that need to be the same as the 2" focuser, or can it be reduced by moving the secondary further up, thereby reducing the light obstruction.
but what is the effect on the resulting angular field of view?
the footprint of a ccd chip in a dslr is a lot smaller than a 2" eyepiece.
so if the secondary is moved up the tube enough to cover the light cone and cover the area of the ccd chip?
i just wanted to understand the concept behind where the secondary is positioned and what the limit is on how far up the tube it can be moved.
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