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| Picture | Name | Stability |
Installation & Adjusting |
Sizing |
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Single Half Curved Vane Spider |
Shakes side to side when telescope is bumped. |
Difficult to adjust to the center of the tube. | Must be very precise, and generally does not allow for adjustments for out of center mirror cells or tube alignments. |
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Single Curved Vane Loop | Tends to shake side to side in what I would call the Jello effect. | Not to bad, a little difficulty adjusting to the center of the tube.. | Must be precise, or use slotted screw holes on an angle bracket which usually causes minor diffraction. |
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Three Curved Vane Spider |
Very stable even when scope is bumped. |
Easy to install. The vanes press against the walls of the scope allowing the spider to be pushed in place first and fastened after checking its position. |
Not to critical since the spider can be inserted in a tube smaller than the spider and the difference is absorbed evenly by the vanes, centering itself fairly well. |
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Four Curved Vane Spider |
Very stable, excellent for Truss type scopes that often have four sides to attach to. |
Easy to install. Can be pushed in place first, marked, and fastened. |
Not very critical since the vane self centers fairly well. |
