Thank you Hefty, that explains some things.

Goggle a bit and must say that is looks fun though.
http://www.gdargaud.net/Photo/Birdseye.html

Matt here is a list link

Indeed you can spent hours on Boj's and when you look the next day you even find more new stuff, it's really large that site.

Most here already know it so the link was more directed to the OP but you're welcome

Btw do you know what a bird's-eye lens is, is it the same as a fish-eye?

Peter you've SDM wrong it stands for Supersonic Direct-drive Motor
I know I'm the worst some time

Also it's easier to copy paste from the Pentax site btw link

Here is a link to helpful site about K-mount lenses, I've linked you to the Terminology link

I wonder if they can see what battery you use but besides that yes you're right you may risk warranty by using them but that's with most third-party products.
If you use batteries and one begin to leak I don't think Pentax would consider it their problem even if they agree the use of that type of battery, or if a sigma lens damage the lens mount or if a Metz flash fries the hotshoe.

If the battery damages the product then you need to bounce at the door of the company of the batteries and I don't know how their support is.
PowerGenix says it's alternative to disposable alkaline batteries so if it cause problems for products that use alkaline batteries you can hold them liable.

Still lithium batteries are approved to be used in the K-X and many other Pentax devices so you've a warranty if something goes wrong, not sure if that means anything...

Here is an PDF from energizer about there batteries link
They say that an OCV of fresh batteries can range from 1.79 to 1.83V

Indeed Pete, I hope they thought about that and made it easy serviceable

They both have there merits Don, I just can't stand how Apple needs to control everything

Will have a look at the software you suggest, going to check them out and I'll have a look if autodesk have something, I quite like their software.

I love the shot Kris, it's almost abstract

SDM failures with the DA*55 :