Thanks all. i have started the fine tuning with the docking station.
I took a set of pictures - middle of the road, sign on building, roof and distant. Then took same pictures at -10 across the board and finally +10. I found it very difficult to differentiate between them! I have been away without the tripod so that won't have helped but the writing on a small electrical box was clear at 20m on all settings...
I plumbed for +10 and want to run some shots through at this and then review and fine tune. I got some pretty good shots of a chiffchaff that started to show (even full screen) some details I'm looking for. Looks like I'm getting there.
If ime understanding you i dont think thats the right way,having to remember this as i dont need to do it now.
You want your target about 25 times the focal length away,if you stand a book up and along side it place a ruler at a 45 degree angle,put the 6 inch mark level with the front face of the book,then focus on the face of the book
When you look at the image the focus point should be on the 6 inch mark,the ruler markings will soon ahow you if its more in focus behind the 6 inch mark or in front.