Da habe ich's doch gleich gefunden:
http://www.asahi-net.or.jp/~zs3t-tk/
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">Zitat:<hr height="1" noshade id="quote">Figure 4 shows the relationship between f/number and surface RMS error when the pulling force is optimized. You easily understand from the figure that smaller and slower mirrors are suitable to Kelley's method. The applicability of Kelley's method is summarized as ;
100mm mirror ---- f/4.3 and slower
150mm mirror ---- f/4.9 and slower
200mm mirror ---- f/5.4 and slower<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Viele Grüße
Jörg