The spider assembly consists of stainless steel vanes, lugs and central rings. All fasteners are stainless steel. The central hub, plates, cell and ribbing are carbon fiber/high temp epoxy.

The upper rings and carbon fiber central hub allow for gross placement of the secondary mirror in: tip/tilt, rotation, axial and lateral positioning.

Once the secondary mirror is roughly in place, rotation can be fine tuned using the rotation assembly. This assembly sits just below the main spider hub and just above the main secondary support ribbing. The 24" Dream Astrograph uses a micrometer that allows rotation as small as 1 arc minute (1/60th of a degree). This rotation contol is independent of all other adjustments and greatly improves collimation control and ease of use.

The 16" Dream Astrograph uses a similar rotation assembly but without the micrometer adjustment. Either can allow free rotation if neccesary.

The secondary mirror's fine tip/tilt is accomplished through the two exposed hex head bolts.

Not shown in the renderings is a flat black cover that will block the direct view the focal plane has on some of the shiny stainless steel hardware.