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Click on the above thumbnail for additional images
of the first 7.75" elliptical secondaries. |
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Click below to see a chart illustrating the advantages
of open-backed cellular optics. |
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The cellular blank to the left is the 7.75" minor axis elliptical
secondary that will be used in the 24"
f3.5 Dream Astrograph. |
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This size secondary was chosen because it will fully illuminate
CCD chips up to 1.42"(36mm) square. The ID of the front
ring on the Optical Support Structure is also sized just larger
than the field of the 1.42"(36mm) square CCD. |
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The 7.75" secondary is 1.5" thick and has a major axis
of 11.15", yet weighs only 2.7 lbs. The first blank, shown
to the left, weighs 2.7 lbs. |
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A monolithic (solid) 7.75" mirror with the same overall
shape and dimensions would weigh 7.2 lbs. |
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A conventional 5.5" minor
axis elliptical secondary, like that which has been used
on our original 16" Dream Astrograph, weighs 3.7 lbs. |
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Click on the small 3-D rendering above to see additional
views. |
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Click on the photo to the left to see the carbon fiber
mirror assembly. |
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