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→See also: Reflecting telescope |
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PLOP produces less mirror [[Yield (engineering)|stress]] than equal area rule calculation: it uses [[Finite element analysis]] and can be set to ignore [[Deformation (engineering)|deformation]] which merely results in refocus of the mirror's [[parabola]].<ref>[http://www.atmsite.org/contrib/Holm/Plop_optimized_cells/cellfaq.html#old Atmsite PLOP FAQ]</ref> It is useful to calculate floating support points for mirror [[Optical axis|axial]] (rear) support however additional tools are needed to calculate potential error from mirror lateral (edge) [[Lateral support|support]].<Ref>http://www.cruxis.com/scope/mirroredgecalculator.htm ''Cruxis'' site mirror edge support calculator tool</Ref> Additionally, PLOP calculations do not overcome error introduced by gluing the mirror to its cell, excessive tightening of edge supports nor impingement of the cell structure onto the mirror as result of differential cooling shrinkage. PLOP is not sufficient for the significantly more complex calculations arising from the support of large [[honeycomb mirror]]s nor those using [[active optics]] systems.<Ref>http://medusa.as.arizona.edu/lbto/tech/ua9502.htm Mirror Support System for Large Honeycomb Mirrors</Ref>
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