Re: ATM (no subject)

["Fred Maxwell - No spam e-mail accepted." <fmaxwell@erols.com>]

David Eric Allen wrote:
{snip}
> The secondary is tilted to the optical axis; for our
> purposes, that part of the axis between the secondary and the eye.
> This places one edge of the secondary closer to the eye than the other
> edge.  This in turn causes the closer half of the secondary to appear
> larger than the more distant half.  
{snip}

Well, I for one, fell that it's about time we start demanding that
telescope manufactuers produce egg-shaped diagonals.  When you think
about it, that's the shape you get when you cut a cone at a 45 degree
angle.  It would provide a smaller obstruction and would appear, to the
eye, to be closer to round when viewed through the eyepiece tube.

Regards,
  Fred Maxwell

P.S.  The above is only half-serious -- though technically correct.