Duplicate figure numbers in Beamer

I am trying to have multiple Beamer slides discussing the same figure, and have the figure have the same Figure number across multiple slides. I am not sure how to do this. In the following example, I would like to have multiple slides discussing "First figure". If I simply create two different figures, clearly they will have different numbers. If I label them with the same label, I get

LaTeX Warning: There were multiply-defined labels.

What I want is something like below, but the second slide to say "Another interesting point about Fig. 1". How can I do this? Thank you in advance!

\documentclass{beamer}

\setbeamertemplate{caption}[numbered]

\begin{document}

\begin{figure}[h]
\centering
My first figure
%\includegraphics{something.png}
\caption{First figure}
\label{fig:first-fig}
\end{figure}
\end{frame}

\begin{figure}[h]
\centering
My first figure
%\includegraphics{something.png}
\caption{First figure}
\label{fig:first-fig-2}
\end{figure}
Another interesting point about Fig. \ref{fig:first-fig-2}.
\end{frame}

\end{document}


-
I get the expected result and no warning. – egreg Feb 19 '13 at 1:07

Although using floats like figure inside a beamer presentation seems wrong, you can use the following:

\documentclass{beamer}% http://ctan.org/pkg/beamer
\usepackage{lmodern}% http://ctan.org/pkg/lm
\setbeamertemplate{caption}[numbered]
\begin{document}

\begin{figure}[h]
\centering\includegraphics[width=100pt]{example-image-a}
\caption{First figure}\label<1>{fig:first-fig}
\end{figure}

The above relies on the overlay-aware \label, as well as other overlay aware things like \only. You specify a single frame and add some slide-specific content using the appropriate notation.
The use of lmodern stems from Warnings with beamer class and itemize. lmodern provides scalable fonts at the sizes required by beamer.