Why would ISO have influence on the image size, never found a difference between photos shot at ISO 100 or ISO 1600 with the K10D?

I think the the buffer size is smaller because of the more pixels of the K5, the 7 FPS and 14bit instead of 12bit.

Entered my first photos (6 in total) last month and all got accepted.
They are all very different so I was surprised to see them all pass.
link to the gallery

I wonder what will happen if I would enter this photo link
I've read that edited photos aren't allowed but the infra-red landscape converted to duotone also got true

That's old fashion why not a LCD shutter?

Yes but it isn't for the ACR alone you buy Lightroom.
The power of lightroom is you work on the original RAW file and you never actual edit that or need to convert that.
If your photoshop use the same ACR as lightroom, lightroom can then direct the original RAW file to photoshop and open it with the lightroom edits.
This how I work so I don't need to convert anything besides with the final output.

There is another use for it, it's when the flash can't dial low enough for the aperture you want to use.

Can't get really cheaper than that.
The flashes that can do HSS are
Pentax - AF360FGZ, AF540FGZ
Metz - 48 AF-1, 50 AF-1, 54 MZ-4i, 58 AF-1
Sigma - EF-530 DG Super

Your best bet would be the Metz 48.

Why do you need HSS for btw?

Smeggy I've no knowledge about converting and I was only talking about bit as a storage file, I think we were both talking about something else.

Indeed it doesn't that was what I was trying to say
But when talking about a digital image storage file the bit count says the amount of information a pixel can hold, so when you say a bit count in combination with a image file it truly means the number of colours.

So when you said 24bit RAW I thought you meant that

The only thing so far with regard to SDXC is that it used exFAT file system (does that mean NTFS? I'm not sure. If it does MAC users won't be happy - it is possibly a hybrid) SD and SDHC used FAT32 not FAT64 as the majority of computers at the time were (and still are) using the FAT32 file system for external devices.
I think at the moment, that SDXC is still to be fully finalised even the SD 4.0 protocol that it demands (there is a hybrid SD 3.0 protocal too where you can get SDHC complaint devices to accept SDXC - but I think this will only apply to devices out within the last 12 months)
Although "officially" it has already been done.

Does the K-5 accept SDXC? I saw in that german markating blurb, no mention of SDXC, only SD and SDHC.

Finally, I am happy too about the ISO80 - great for landscapes and blurred water in bright light [/quote]FAT64 and exFAT are the same thing, I believe that FAT64 is the old name.

exFAT is different from NTFS, you can read a quick comparison here link
However the rights are under Microsoft though and isn't free.
Here is something about the licenses link

SDXC support was named as a firmware update for the K5 on the official site or newsletter.

Was actually thinking for in the studio, hopefully I can use the lenses better wide open now.

Depends on the sensor.
Most indeed are around ISO200 but to get better high ISO preformance you have some sensors with a higher base like the K-X which has a base closer to ISO400.
I do hope the base for the K5 is around the 200 though, I'm not a high ISO user but the expansion to ISO80 brings hope.

Here is an animation of a brush-less DC motor.
http://www.townbiz.com/animations/4-pole_bldc.html

It's been a long time but I believe the DC in the Pentax use the same principle.
Only the rotor (the bit that turns) isn't surrounded by the stator (the bit that doesn't turn).

How is the Sigma camera with compatibility with other lens makes, I don't think that besides Sigma anyone else make lenses for it, if so you should think carefully before making such a commitment.