Changing font size of selected slides in beamer

I am preparing a presentation and I have some slides with up to 15 equations. How can I make the font size of these slides smaller? I need to change the font size to 6.

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Welcome to TeX.sx! How do you create the presentation? Beamer? –  N.N. Nov 7 '11 at 15:13
Thanks!Yes, I use a beamer template: \documentclass[10pt]{beamer} –  anna Nov 7 '11 at 15:20
I think you should not do this. Think about the 50 year old guy with the glasses somewhere at the audience. It's better to split a frame into two and to scroll forward and backward than to have all at one frame but nobody can read it. –  Schweinebacke Nov 7 '11 at 15:25
@Schweinbacke I agree with you in general as 6pt is probably too small for a presentation, but sometimes 10pt is just a bit too large and it's better to squeeze that last line onto your slide rather than splitting it into two. Furthermore, it may be valuable to add an "equation reference" slide if the presentation is to be printed. Both of which require a technique to change the font size for the slide. –  cheshirekow Sep 2 at 16:34

You can use \fontsize:

\fontsize{<font size>}{<value for \baselineskip>}\selectfont

For example,

\fontsize{6pt}{7.2}\selectfont

changes the font size to 6 points and the \baselineskip to 7.2 points. You can define a new command to apply the change:

\documentclass{beamer}
\usepackage{lipsum}

\newcommand\Fontvi{\fontsize{6}{7.2}\selectfont}

\begin{document}

\begin{frame}
\frametitle{Frame with reduced font size}
\Fontvi
\lipsum[1]
\end{frame}

\begin{frame}
\frametitle{Frame with regular font size}
\lipsum[1]
\end{frame}

\end{document}
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Thanks, it solved my issue! –  anna Nov 7 '11 at 15:41
@anna: Since my response seems to answer your question, please consider marking it ‘Accepted’ by clicking on the tickmark below its vote count. –  Gonzalo Medina Nov 7 '11 at 15:53
@Will I think you should repost your comment as a fresh question. Follow-up questions like this are more than welcome! In the new question you can link to this question to provide the background and don't forget to add a minimal working example illustrating the problem. –  Gonzalo Medina Jun 11 '12 at 23:23
This doesn't seem to affect things more than one level deep inside itemize lists... –  naught101 Nov 5 '12 at 5:12