|
For the sake of clarification about the 6 point cell, the bars must be straight.
I've run the numbers in Plop for an optomised cell for Stevens case where he has allready drilled collimation bolt holes at the 56% zone. Including a little optimisation of pad angle, the flotation points on the bars will be 96mm apart ( which effectively works out at about 63% zone ) with the collimation points/fulcrums at the 56% zone. This yields a surface RMS error of 1/366 wave for the 35mm thick mirror, quite good enough by anyones standards I think.
Don't get too obsessed about the precision of the cell , there is quite a bit of leeway before you would ever notice anything at the eyepiece.
|