Spider vs frealign astigmatim convention

Submitted by adesgeorges on Wed, 2010-09-29 14:30

Forums

Frealign

Hello,

I made a script to convert my spider defocus and astigmatism values into the frealign convention.

The formula I use is:

df1 = spider.defocus - spider.magastig/2

df2 = spider.defocus + spider.magastig/2

angast = spider.angast + 45

Does that sound correct?

By advance, many thanks.

niko Wed, 2010-09-29 16:40

I just looked at the Frealign and Spider code (command TF C) and compared the formulas. Your conversion looks right.