ATM mirror fixing

["stipe vladova" <stipe.vladova@st.hinet.hr>]

For  Robert  Turner

Robert, I  am  Stipe  from  Croatia. The  8"  f7  mirror  is  not  so
difficult  to  parabolise. The  central  depth  may  be  reduced  by
cutting  the  central  area  of  the  lap, and  work  very  careful. You
can  get  the  other  zones  undercorrected, than  you  can  parabolise
with  a  long "W"  stroke. Never  use  central  stroke  because  of  getting
zones  and  surface  roughness. Be  sure  you  have  a  smooth  optical
surface.

Stipe