Hi guys
Firstly thanks all for the great advice, not least responding and helping out. RTFM. Yes well...... I had downloaded the manual about a month before I got the camera. Just to familiarise myself with the operation. I always download onto my ipad so always have manual with me. Page 39 was the first place that I looked. The wheel on the back is symbolised by the wheel as per page 39. However, I have tried this and it didn't work. However, if I am correct you are suggesting to press the ok button before turning the wheel.
I am very excited to try this ASAP. I will post result. Fingers crossed.
Otherwise this is a great camera. I can say this with authority. As I have a phase one IQ 180 and am comparing it directly. Couldn't justify the price tag for the iq250 which is a CMOS sensor. Could get 3 pentax 645 for the same price!!!!!!
Thanks again for your great responses. Will let you know what happens.
Cheers
Bilby