Even with perfect shots you see the difference.

In the middle there is a comparison.
http://www.imaging-resource.com/PRODS/K5/K5IMAGING.HTM

RAW has a lot more fine details and less halos from sharpening.

The mirror start moving quite abruptly and is basically "slammed" against the stop at the top.
I don't know how heavy the mirror is and how fast it moves but i would find it very strange that the force you apply with a soft brush would be greater.

here is the K-X in action.
http://www.youtube.com/watch?v=bFDas-9UJS4

And here it is in slowmo
http://www.youtube.com/watch?v=LJiIQZ9iX-k&feature=related

It's marvelous to see how fast and precise it is but it is anything but a subtle movement.
So if the mirror would start moving because i touch it lightly with a brush it would most likely move during the action as well by the air it moves around and when the mirror start and stop moving.

But those lenses also fit on Canon though

Live view maybe?

Well you can always get the brush visibledust (articbutterfly) make for cleaning the mirror and focusing screen but i've no idea what the difference is between the normal one?
http://www.visibledust.com/products3.php?pid=603

And it keeps the mind young

Most of the time you're able to right click on the image and select the option "Copy Image Adress" that does the trick as well.

So the forces you apply with the brush are greater than the forces when the mirror moves?

Is sure believe you that it's precision mechanism and fragile but i don't believe it's that fragile that the forces of the brush will actually do any harm unless you are using a hard brush of course but we are talking about the butterfly now and that's a soft brush. You don't even have to press the hairs against the mirror since it's the static charge of the hairs that do the work so you have to ever so lightly just "caress" the mirror once, a good puff of air might even result in a higher force on the mirror.

Great to hear.

Sadly i've only use it 2 times now so can't really say how good or bad it is.
I had bought it for weekends away or when going on long walk but sadly i didn't had the time to do any of that.

I did went away on photo trips but those whore in the city and there i find a shoulder bag with less gear far more handy because the bag is very big.

So far i've been happy with it though but look around for the price and if you can't find anything the shop i linked to might sell to the UK, i doubt that will eb a problem.

Yeah on walk a laptop isn't that handy so you might as well use it for something else

I've been thinking as well to convert a 60 liter back to a photo back as well.
I believe it was Lowe (or berghaus) that had actually 2 main compartment that you could access separately, you might give them a look if you think about doing that.
For one day hike the Kata is good enough but you can't carry anything that will get you through the night so you will need something bigger/better for a weekend or very technical walks.

Yes thanks that was the one.

North-light has great articles about colour management as well.