Lurie-Houghton Telescope
Front View
All of the optical parts can be seen in this view through the front of the
telescope. The most obvious optical element
is the corrector lens assembly. It has
no optical power so it looks just like a window and doesn't distort the view
of the inside. In this view it's not really possible to see the two separate
lenses. The clear aperature of the
corrector is 9.8 inches. The 10 inch spheroidal
primary mirror is visible at the back
of the scope. The view through the
focuser and eyepiece can be seen reflected in the
diagonal secondary mirror whose
reflection can be seen in the primary mirror.
If you look carefully, you can see the offset of the secondary mirror. It is
shifted away from the focuser so it properly truncates and captures all of the
light in the focused cone of light from the primary mirror. Reflections are
visible on the inside walls of the telescope, but this will be taken care by
lining the inside of the tube with flocked paper when the scope is completed.
This photo was taken 11 August 2000 with an Olympus D-600L digital camera.
Lurie-Houghton Telescope Home Page
Rick Scott's Natural Images Home Page
Updated: 19 August 2000
