Sorry Chris,
that is because I was only talking about the DA*55.
Typed it just a bit too fast

Bokeh is how nice/smooth the lens renders the a point of light in the out of focus area. To put it simpler, how smooth the out of focus blur is.

This an comparison between the two lenses link

f numbers, or aperture values, are a measurement of the size of the hole that the light passes through in the rear of a lens, relative to the focal length of the lens.

That's also the only thing that I know for sure and I know there are tricks for that but I won't say anything about it since I simply don't know.

The DA*55 has better optics also newly desgined they say, better coatings, weather sealed and SDM.
Also the DA*55 is quite a bit sharper certainly when you stop it down a stop, the bokeh is so good as the same with both lenses.

PS. better now Chris?

Yes the mount that Canon has is one of the biggest, 54 mm internal.
Pentax K-mount 45.46 or 45.50 mm.

Picked form pentaxforums.com
Regarding an f/1.0 lens from Pentax: The 50mm f/1.4 has a rear element ~29mm in diameter, giving it an area of 660.5 sq.mm. The 50mm f/1.2 has a rear element diameter of ~35.5mm, giving it an area of 989.8 sq.mm. These numbers make sense: f/1.2 is 1/2 stop faster than f/1.4, so the area of its rear element should be 1.5 times larger; and it is.

A 50mm f/1.0 lens would have a rear element twice the area of the f/1.4, which would mean its diameter would have to be square root of 2 larger. That gives us ~41mm. Take any K mount lens and measure that width; you'll see that the aperture lever would have to be removed in order to have a rear element that large and the glass would be very near the edge of the mount.

Congratz with your ordered lens, Andrew.
Let us know how it preforms.

Max,
From the reviews that I've seen from the Tamron 18-270 it prefoms just as good. It seems that optically it's the same design but it can strecth out a bit further so to say. It would be a great lens if Pentax would bring it out with SDM so that it has faster focus and quick-shift, that was something I really missed on the DA18-250. Maybe in the spirit of the upcoming kit lenses also with WR, that would be sweet.

I would skip the both kit-lenses to behonest and get a DA55-300 or WR is a must of course.

Also don't forget the second-hand market the pentax A50mm f/1.7 aren't that expensive. There is also an A28 f/2.8, those aren't expensive either I believe. With A lenses you still have most function but no AF.

This a nice site to look around to see what lenses can fit on your pentax. link

The Lowe Primus AW also looks like a great bag, played with it in the shop and it seems like a good bag for long day hikes but they aren't cheap. link
or else a fastpack would also be a good bag I believe, it looks like a slingshot but a bit different.
If you want to carry more non relate camera stuff the Rover serrie should be better.

These are all Lowe-pro products but there is also tamrac and many others brands to look at.

ps. Technoblurb, a sniker has more energie in it then a Mars and it's the same size

The DA18-250 was optical the same as the tamron lens and it also didn't had quick-shift.

So maybe the lens was made in the same factory as tamron and since tamron stopped production because of the newer 18-270.
Maybe we will see a 18-270 also for pentax or even with a pentax batch.

Also the 18-250 is one of the last lenses made in Japan all the others are made in Vietnam if I'm correct. Maybe that have something to do with it aswell. Who knows???

To be honest the DA18-250 is a fine lens, I had one and sold it to finance the DA*50-135. I didn't use it to often and didn't need to range.
The lens isn't so fast with focusing so maybe the Sigma 18-250 with HSM would focus faster and would have something like quick-shift but I don't know if the optics are as good.

same thoughts here Matt, but still it's fun to speculate about it.

It's of course great marketing to show blurry photos of up coming products, simply getting everyone a bit "arroused", it's like for play so to say.
Don't ask me about why i'm using sexual terms but you get me now at least

A 50mm 1.0 would be imposible, the rear element of the lens needs to have a larger diameter then the mount itsself.
On a K mount 1.1 is the very limit so very very hard to construct so that's why we have a 1.2 lens.

We could see a 35mm f/1 of course and I would be very happy with such lens since the DOF would be a bit more wider then with a 50mm, so more usefull.

The K20D is a fine camera and one that will take you decade to full master so you don't have to worry, when you buy a K20D by the time you will look for something better you might be loking for the K-8 most likely.

The K20D is quite a dive into photography though, your photos won't be the greatest the first one or two months since you need to master the beast. It's like trying to drive a F1 car for the first time. The first round will probable be much slower then the time you can set with your own family car but when you get more skilled the family car is no match for the F1.

The K-M is a beast that has been tamed, probable after a week you get better photos then with your point & shoot but in the end might not learn so much then what you'll from the K20D.

So if you go from the K-M to K-7 grade camera you'll need to learn some more, there is a gap between the two. If you want to take it on holiday this summer you're to behonest too late to buy a DSLR, you won't be able to get the best out of it but with the K-M you might be able to pull it off though but with the K20D you'll need to do a crash course.