diff --git a/ptbposter/ptbposter-test-hoch.pdf b/ptbposter/ptbposter-test-hoch.pdf
index d5c6ac858a10b097d8e68316eff78bece6203b03..d9368907c59b43e86ddbadff9f8cfdea9c59cdee 100644
Binary files a/ptbposter/ptbposter-test-hoch.pdf and b/ptbposter/ptbposter-test-hoch.pdf differ
diff --git a/ptbposter/ptbposter-test-quer.pdf b/ptbposter/ptbposter-test-quer.pdf
index 586ae1ed0ec45d059dcb9e33dab3fcb382f16144..db8dd83602fd82fc9c36b75dbaefb2727151533a 100644
Binary files a/ptbposter/ptbposter-test-quer.pdf and b/ptbposter/ptbposter-test-quer.pdf differ
diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index f6b917f4fbcf437cbee0cb1834d3b34f0bfae67f..767e27bfa196116fc82684f009db95a02d3ccd5f 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -150,7 +150,7 @@
   \put(\PTB@leftmargin,-160mm){\sffamily\titleFontSize\@title}%
   \def\and{, }%
   \put(\PTB@leftmargin,-190mm){\sffamily\authorFontSize\@author}%
-  % hier wird auch \@thanks gefüllt
+  % hier wird \@thanks gefüllt
   \put(\PTB@leftmargin,-105mm){\linethickness{2mm}\color{PTBcolor}%
     \line(1,0){\dimexpr\paperwidth-2\PTB@leftmargin}}
   \linethickness{2mm}
@@ -166,12 +166,11 @@
     \linethickness{.5mm}%
     \put(-.5\@wholewidth-\PTB@textsep,-57mm){%
       \ifx\PTB@qrcode\@empty
-        \color{PTBcolor}%
-        \framebox(46mm,46mm){}%
+        \color{PTBcolor}\framebox(46mm,46mm){}%
       \else
         \raisebox{19mm}{\qrcode[height=47mm,tight]{\PTB@qrcode}}%
       \fi
-      \color{PTBcolor}\footFontSize\sffamily
+      \color{PTBcolor}
       \hspace{2mm}\raisebox{-.5mm}{\rule{47mm}{47mm}}%
       \hspace{2mm}\framebox(46mm,46mm){}%
     }
@@ -180,9 +179,9 @@
       \begin{tabular}[t]{@{}l@{}}
         Physikalisch-Technische Bundesanstalt \\
         Braunschweig und Berlin \\[\f@baselineskip]
-        \textbf{\first@author} \\
-        \PTB@department \\
-        \PTB@workingGroup
+        \ifx\first@author\@empty\else \textbf{\first@author}\\ \fi
+        \ifx\PTB@department\@empty\else \PTB@department\\ \fi
+        \ifx\PTB@workingGroup\@empty\else \PTB@workingGroup\\ \fi
       \end{tabular}%
     }
     \put(307mm,-17mm){%
@@ -191,10 +190,9 @@
         \ifx\PTB@location\@empty\else\multicolumn{2}{@{}l@{}}{\PTB@location}\\\fi
         \ifx\PTB@phone\@empty\else Telefon:&\PTB@phone\\ \fi
         \ifx\PTB@fax\@empty\else Fax:&\PTB@fax\\ \fi
-        \ifx\PTB@email\@empty\else E-Mail:&\PTB@email\\ \fi
+        \ifx\PTB@email\@empty\else E-Mail:&\href{mailto:\PTB@email}{\PTB@email}\\ \fi
         \multicolumn{2}{@{}l@{}}{www.ptb.de}
       \end{tabular}%
-      %\rule{\linewidth}{5mm}%
     }
     \put(444mm,-17mm){%
       \begin{tabular}[t]{@{}l@{}}
@@ -303,7 +301,7 @@
 \newcommand*\footFontSize{}
 \newcommand*\titleFontSize{}
 \def\authorFontSize{\@setfontsize\authorFontSize{53.3}{63.96}}
-\def\footFontSize{\@setfontsize\footFontSize{19.27}{23.124}}
+\def\footFontSize{\@setfontsize\footFontSize{19.2}{23.04}}
 
 \newcommand*\scaleTitleFontSize[1]{%
   \@ovri=106.6pt %