HI, ; I like this formula, it looks similar to ManyMods I´m using for my software but it has more deep zooming power and better details. Mike, sorry if I have not quoted the name correctly in the parfile. The link replaces the link in my reply to Hal. ; https://www.dropbox.com/sh/vctktfz0d72sr0t/GWJDJr8Aqe ; Cheers, Albrecht