\begin{table}%t1
%\centering
\par
\small\caption{Observation log.}\label{t_log}
\begin{tabular}{ccccc}
\hline\hline 
Field & Night &Filter & $N$ &DIT $\times $ NDIT \\
\hline
\deep\  & 10 Nov. 2000 & $J$   &  8       &  $10\times12$\\
        & 10 Nov. 2000 & $H$   &  8       &  $ 5\times24$\\
        & 10 Nov. 2000 & $\KK$ &  16      &  $ 5\times12$\\
\shallow\ & 11 Nov. 2000 & $J$   &  1       &  $ 5\times12$\\
        & 11 Nov. 2000 & $H$   &  1       &  $ 2\times30$\\
        & 11 Nov. 2000 & $\KK$ &  1       &  $ 2\times30$\\
\hline
\end{tabular}
\end{table}