Well, resolution wise f8.0 appears to be better:
http://www.takinami.com/yoshihiko/photo/lens_test/pentax_normal.html
I do not know about other lens characteristics (bdimitrov comment is most 
likely based on these results).

Knut

At 13:34 18.06.02 -0400, you wrote:
>Thanks for the advice.  I particularly like the phrase "trust the lens".
>  BTW, the site which listed f8 as the best aperture was
>http://www.bdimitrov.de/kmp/index.html
>
>
>Steven Desjardins
>Department of Chemistry
>Washington and Lee University
>Lexington, VA 24450
>(540) 458-8873
>FAX: (540) 458-8878
>[EMAIL PROTECTED]
>
> >>> [EMAIL PROTECTED] 06/17/02 11:40PM >>>
>Trust the lens, it's right (for what it's worth).
>
>tv
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Len Paris
> > Sent: Monday, June 17, 2002 6:10 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Best aperture for the FA 50 1.4
> >
> >
> > I think you should go with what is programmed into the chip in
> > the lens, which is what you get when you select MTF mode on a
> > PZ-1p or use the sharpest aperture setting in the MZ-S.  The
> > body and lens communicate correctly.  Go with it.  However, if
> > f8 suits you better, you lose nothing by using f8.
> >
> > Len
> > ---
> >
> > ----- Original Message -----
> > From: "Steve Desjardins" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Monday, June 17, 2002 3:27 PM
> > Subject: Best aperture for the FA 50 1.4
> >
> >
> > > Greetings,
> > >
> > > I seem to remember seeing somewhere that the "sweet spot" for
> > the FA 50
> > > 1.4 was f8.  However, when I use the exposure program on the
> > MZ-S that
> > > tries to choose the sharpest aperture I spend a lot of time at
> > f5.6,
> > > which is obviously what Pentax thinks.  Any thoughts on this?
> > >
> > >
> > > Steven Desjardins
> > -
> > This message is from the Pentax-Discuss Mail List.  To unsubscribe,
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> > visit the Pentax Users' Gallery at http://pug.komkon.org .
>-
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