There's no need to reformat SD Cards, just delete the files
and check with Scandisk or Minitool.

You can't reformat an Eye-Fi Card without damaging it.
It will delete the programs. Delete the files is the only
way.

I have other files and Custom Icons on several of my cards,
so I just delete the photos after transfer to PC.

With a K-5 and firmware v1.01 it could possibly damage
an SDXC Card if you try to format it. Needs to be v1.02
at least. Hopefully it won't be recognised.

The official SDFormatter v4 is available from
https://www.sdcard.org/consumers/sdxc_capabilities/using_sdxc/
This will do a FULL WIPE if needed.

I usually carry out a "Partition Surface Read Test" on my
cards using Minitool
http://www.partitionwizard.com/free-partition-manager.html

Takes probably 15 min and shows any bad sectors
or sectors if you are American

'

That isn't the SMC version of the F 28-80mm although it's
still a decent enough lens.

The bottom of the page that you have posted the link to
has links to several other sites with lens tests and
sample images of this lens.

'

That's a very low price. Bargain for someone.

Where would we be without this country?

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That sounds American to me

http://www.everbuild.co.uk/gaffa

How do you pronounce titanic? taɪˈtæn.ɪk or tit-anic

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I can't make head nor tail of Dx0 lens tests

I can't see this lens being suitable for landscapes it
reaches a peak at f/4 and then starts to fall off

Seems OK on test charts

Some more sample shots link...... seems OK at 35mm, but so are
a lot of lenses

There's a Pentax 28mm f/2 for sale on the forum which would
probably be a better buy.

'

Some test results...

http://www.cetussoft.com/pentax/resolutn.htm

http://www.takinami.com/yoshihiko/photo/lens_test/pentax_normal.html

Generally the A Series are sharper than the M Series.

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That's incorrect use of Gaffa Tape.... lose 10 points!

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There are several versions of the the Pentax 28-80mm
The SMC F version is the best. Top lens.


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