# Displayed math looks bad using beamerposter with lmodern

I'm using a theme for beamerposter that requires the package lmodern. Specifically, I'm modifying the theme found here. However, the displayed equations do not look right when I use lmodern.

MWE:

\documentclass[final]{beamer}
\usepackage{lmodern}
\usepackage[english]{babel}
\usepackage{times}\usefonttheme{professionalfonts}
\usepackage[orientation=portrait,size=a0,scale=1.4,debug]{beamerposter}
\begin{document}
\begin{frame}{}
\begin{block}
\centering
{\VERYHuge $\sum_k^\infty$}
\end{block}

\end{frame}
\end{document}


The sigma for the \sum here is tiny. It looks normal if I do not use the line \usepackage{lmodern}. It also works fine if I use lmodern in beamer without beamerposter.

-

This is the normal (in the sense of systematic) effect on large mathematical symbols when using lmodern. You should try with \usepackage{exscale} after lmodern.
Interesting. May I suggest you may want a package that supports math typesetting, like mathptmx, instead of times, which does not?
I'd rather suggest \usepackage{newtxtext,newtxmath} or the MathTime Pro Lite (requires non standard installation). –  egreg Jun 18 '13 at 9:12