I think thats a great idea and would certainly buy it.

I would even volunteer my services if you want any pics taken of certain setups and settings to use as examples. (pictures speak a 1000 words as they say)

As to what you can charge for it and going from E-Books i have purchased in the past I think around $15/$20 should cover it, what do you think:

I know your guides have helped me immensely in the past, as well as others, so i believe it will be a winner.
Would you have to get Pentax's permission : They may even buy it from you.

You have to take into account though that you may not be so willing to give advice here on the forum when the flash questions come up

Anyway thats just my thoughts on it

Looks like some sort of locust maybe :

I have a Bigma which I recommend and also the DA*300mm which can be used with a good quality teleconverter for more reach.

But if you want to take out a second mortgage you can get one of these puppies link

Chirpy does have this lens and if you run a search you will find some pics he has posted.

I can't believe they would bundle the two together if they were not 100% compatible. Seems outrageous to me.

Is it possible the 2x converter could be faulty. It certainly sounds like there is a fault somewhere with either the lens or the converter.
Have you given the mounts and contacts a good clean:
I would go back to Chris and try another converter if i were you.

I second that proposal:
If pentax are too busy or lazy to write a decent manual for thier flashes, why not ask Matt to write it and pay him the royalties he deserves.

Thanks for that Matt, I will definately give that a try

I actually kept the 135mm 3:5 just to use on bellows but haven't had a chance to try it yet.

I also have another 135mm I intend to use as well, Its a Phot-All brand which I have never heard of with a 2:8 aperture and 16 bladed iris which i understand will improve the bokeh of the lens.

I sold one last week to a chap in Japan, It went for AU$150. I picked it up with an old ME camera kit, It wasn't even mentioned in the listing. To be honest I didn't know anything about it and I didn't even try it, I relisted it the same day I found it in the bag.

I also got a Pentax SMC M 135mm f3:5 with it. What do you suppose that is worth. :

I'm afraid there is no such adapter (that i know of) to use Canon lenses on a pentax body. The Canon mount is just to big to fit into the Pentax body. But it is possible to fit a pentax lens into a Canon body with the right adapter.

The Sigma 180 is a cracking good lens but as hefty1 says, they are little scarce and difficult to get hold of.