Dream Astrograph - 24" custom cellular secondary designed by Shane Santi and made exclusively for Dream Telescopes & Accessories, Inc.

 The first batch of 7.75" cellular secondaries arrived November 30th, 2007.


Click on the above thumbnail for additional images of the first 7.75" elliptical secondaries.

Click below to see a chart illustrating the advantages of open-backed cellular optics.

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.

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.

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.
A monolithic (solid) 7.75" mirror with the same overall shape and dimensions would weigh 7.2 lbs.
A conventional 5.5" minor axis elliptical secondary, like that which has been used on our original 16" Dream Astrograph, weighs 3.7 lbs.

Click on the small 3-D rendering above to see additional views.

Click on the photo to the left to see the carbon fiber mirror assembly.





pricing, availability and specifications subject to change without notice