on my K7 the I use AF-C mostly and find that with either the 18-250 or the bigma that is virtually impossible to getv it to focus on infinity, evenn if i spot focus on a point way into the distance.
my question(s) is/are:
does the focusing system use fuzzy logic? if it does could it explain the never reaching infinity problem.
i find this especially annoying with the 18-250 as i get unsharp detail at distances far greater than the 30 metres marked on the lens. or could it be having shake reduction on when camera on tripod?