Quote:
Originally Posted by mental4astro
As the 'cone' of light comes up to the secondary from the primary, the geometric shape it hits the sec at is not an even one, rather more pear shaped, fatter at the bottom, narrower at the top. Alex.
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Sorry Alex but that is not the case. It is in fact an ellipse just like the secondary. A cone cut at 45 degrees is an even ellipse.
We offset the secondary to optimise it's size, not to compensate for any "pear shape"
Dave