While using my A700 today either I or it (or perhaps both of us) got confused. Most of the time I have AF area set to "Local" and this is what I was using. I was using the AEL button to set the exposure, before recomposing on occasion, and changing setting quite quickly so perhaps fumbling the controls. I suddenly noticed that I couldn't switch AF position and on examining the camera I saw that some how I had got in to the Spot AF area setting, rather than the Local AF area that I had started in. Thinking there must be some combination of buttons and control dials that I had pressed by accident, I then hit Fn to try and correct the AF area but found that I could not select this function. In to the Menu, but AF area was greyed out?! Weird I thought. I struggled for about 5 mins to try and find out what I had done to achieve this strange setting but to no avail. I also noticed that AF was refusing to work - the central point would flash, but nothing would happen, just like it does when it is too dark etc. I switched bodies for the rest of the trip out. When I got home I examined the manual but couldn't find anything. The only thing that got rid of this setting was changing lenses. I changed lens and all was back to normal - I could chose the AF area using either Fn or the menu, and AF was working again. I changed back to the original lens (Tamron 17-50/2.8 ) and everyuthing still worked - phew! Any ideas how I caused this problem?
. I'm sure this will not make that much differenece in the end, but it is annoying.