Consider the following

\documentclass{beamer}
\usepackage{newtxtt}
\beamertemplatenavigationsymbolsempty
\newcommand{\tst}{$2^{e_{\textnormal{min}}}$}
\begin{document}
\tst \\
\begin{footnotesize}\tst\end{footnotesize}
\end{document}

The newtxtt package makes the second "min" bolder than the first one.
So this looks incorrect.

Moreover, this package is described as follows:
"Enhancement of typewriter fonts from newtx".

But "min" is not in a typewriter font, thus should not be affected
by this package.

Is this a bug in beamer or newtxtt?

--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Am Fri, 18 Feb 2022 17:57:55 -0000 (UTC) schrieb Vincent Lefevre:

> Consider the following
>
> \documentclass{beamer}
> \usepackage{newtxtt}
> \beamertemplatenavigationsymbolsempty
> \newcommand{\tst}{$2^{e_{\textnormal{min}}}$}
> \begin{document}
> \tst \\
> \begin{footnotesize}\tst\end{footnotesize}
> \end{document}
>
> The newtxtt package makes the second "min" bolder than the first one.
> So this looks incorrect.

> Is this a bug in beamer or newtxtt?

Neither. newtxtt loads T1 encoding and so the cm-super fonts are
used. They have more optical sizes. So at e.g. 5pt sfss0500.pfb is
used which looks rather bold, while with OT1 encoding cmss8.pfb is
used and scaled down. So the second looks thinner.

You could use \usepackage{lmodern}, it has with T1 similar sizes as
the original cmss fonts. Or you could change the font definitions of
the ec-family so that it no longer uses that optical size.

\documentclass{article}

\begin{document}
\fontfamily{cmss}\selectfont
normal text
\fontsize{5pt}{6pt}\selectfont min
\fontencoding{T1}\selectfont min
\fontfamily{lmss}\selectfont min
\end{document}

--
Ulrike Fischer
https://www.troubleshooting-tex.de/

In article <1q5h2w6ehzlsw$.dlg@nililand.de>,
Ulrike Fischer <news3@nililand.de> wrote:

> Am Fri, 18 Feb 2022 17:57:55 -0000 (UTC) schrieb Vincent Lefevre:

> > Is this a bug in beamer or newtxtt?

> Neither. newtxtt loads T1 encoding and so the cm-super fonts are
> used.
[...]

Indeed, I can reproduce the issue when replacing \usepackage{newtxtt}
by \usepackage[T1]{fontenc}.

> You could use \usepackage{lmodern}, it has with T1 similar sizes as
> the original cmss fonts. Or you could change the font definitions of
> the ec-family so that it no longer uses that optical size.

I always use \usepackage{lmodern} in my own LaTeX files (this file
isn't mine), which explains I didn't suspect the T1 encoding (which
I always use too) as I had never seen such an issue before.

--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Ulrike Fischer <news3@nililand.de> writes:

> Neither. newtxtt loads T1 encoding and so the cm-super fonts are used.
> They have more optical sizes. So at e.g. 5pt sfss0500.pfb is used
> which looks rather bold, while with OT1 encoding cmss8.pfb is used and
> scaled down. So the second looks thinner.
>
> You could use \usepackage{lmodern}, it has with T1 similar sizes as
> the original cmss fonts. Or you could change the font definitions of
> the ec-family so that it no longer uses that optical size.

Ahh, thanks for this analysis. It explains why I didn't see any issue
when compiling Vincent's MWE with lualatex.

--
Uwe

Ulrike Fischer wrote:
> You could use \usepackage{lmodern}, it has with T1 similar sizes as
> the original cmss fonts. Or you could change the font definitions of
> the ec-family so that it no longer uses that optical size.

A third option is loading fix-cm.

It is my default, although I don't quite see why. In theory optical font
sizes ought to be better, that's why classic typography invented them in
the first place. It seems we're all so used to mindless scaling by now,
that everything else looks strange.

--
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Am Sat, 19 Feb 2022 11:10:06 +0100 schrieb Axel Berger:

>> You could use \usepackage{lmodern}, it has with T1 similar sizes as
>> the original cmss fonts. Or you could change the font definitions of
>> the ec-family so that it no longer uses that optical size.
>
> A third option is loading fix-cm.

That is not a third option but my second. fix-cm change the font
definitions:

\DeclareFontShape{T1}{cmss}{m}{n}{
<-9> ecss0800
<9-10> ecss0900
<10-12> ecss1000
<12-17> ecss1200
<17-> ecss1728
}{}

The line
<-9> ecss0800

force latex to use ecss0800 for all sizes smaller than 9 pt.

> In theory optical font sizes ought to be better,

But in real life font designer are humans and can make errors. Imho
the five pt sans serif font of cm-super looks a bit odd.

--
Ulrike Fischer
https://www.troubleshooting-tex.de/