modifying margins for one slide

Question

I need help for modifying the margins for only one slide in the beamer class

In other words, I need a local version of

\setbeamersize{text margin left=<size>,text margin right=<size>} 

in here

\documentclass{beamer}
\usetheme{Rochester}
\usepackage{lipsum}

\setbeamersize{text margin left=5pt,text margin right=5pt}

\begin{document}

\begin{frame}
\lipsum[2]
\end{frame}

\end{document}

Answer 1

You can define a command for this using a minipage of the desired width inside a \makebox (using the optional argument you can change the default value of 3em to any desired value):

\documentclass{beamer}
\usetheme{Rochester}
\usepackage{lipsum}

\newcommand\Wider[2][3em]{%
\makebox[\linewidth][c]{%
  \begin{minipage}{\dimexpr\textwidth+#1\relax}
  \raggedright#2
  \end{minipage}%
  }%
}

\begin{document}

\begin{frame}
\lipsum[2]
\end{frame}

\begin{frame}
\Wider{\lipsum[2]}
\end{frame}

\begin{frame}
\Wider[4em]{\lipsum[2]}
\end{frame}

\end{document}

Another option, would be to use a list, and this can be easily done using adjustwidth from the changepage package:

\documentclass{beamer}
\usetheme{Rochester}
\usepackage{changepage}
\usepackage{lipsum}

\begin{document}

\begin{frame}
\lipsum[2]
\end{frame}

\begin{frame}
\begin{adjustwidth}{-1.5em}{-1.5em}
\lipsum[2]
\end{adjustwidth}
\end{frame}

\begin{frame}
\begin{adjustwidth}{-2em}{-2em}
\lipsum[2]
\end{adjustwidth}
\end{frame}

\end{document}

Answer 2

Here is another solution using a columns environment with a single column:

\documentclass{beamer}
\usetheme{Rochester}
\usepackage{lipsum}

\begin{document}
\begin{frame}
  \begin{columns}
    \column{\dimexpr\paperwidth-10pt}
    \lipsum[2]
  \end{columns}
\end{frame}
\end{document}

Answer 3

Based on the minipage approach of the Answer of Gonzalo you can also introduce a new frame environment (environ package required) which is neat option if you'd like to use consistent wider frames for multiple slides or regularly want to change the textwidth of the whole slide.:

\documentclass{beamer}

\usetheme{Rochester}
\usepackage{lipsum}
\usepackage{calc}
\usepackage{environ}

\newcommand{\halfmargin}{0.05\paperwidth}
\newcommand{\margin}{0.10\paperwidth}

\beamersetrightmargin{\margin}
\beamersetleftmargin{\margin}

\NewEnviron{wideframe}[1][]{%
\begin{frame}{#1}
\makebox[\textwidth][c]{
\begin{minipage}{\dimexpr\paperwidth-\halfmargin-\halfmargin\relax}
\BODY
\end{minipage}}
\end{frame}
}

\begin{document}

\begin{frame}
\lipsum[2]
\end{frame}

\begin{wideframe}
\lipsum[2]
\end{wideframe}

\end{document}

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