I have the lux and find it unbelievably useful photographing a project inside the bowels of old buildings, often in very low light with light streaming in. This lens holds an extreme contrast range well. Beautiful rendering, very sharp, nice OOF... magnificent and I have found myself using it about 50% of the time indoors.
This brings me to the off centre focus issue. Technically, if you focus on something pointing straight at it then swing away so it is off centre, the plane changes and so does the required focus distance, but in reality it matters less than you think inless making extreme changes with very fast lenses. it does catch me out once in a while, but so do the off centre focus patches on my EOS! With my 85 1.2L, the centre patch is more reliable, even through recomposition, where the subjects eyes end up 1/3 of the way down a vertical frame, than using the off centre patches. This was messing with my head so I tested it and what do you know? Using the centre patch and recomposing was on average more accurate despite the changed focal plane.
The other issue is that really fast lenses tend not to be pin sharp at the edge of the frame wide open so it is a good idea not to place the subject too far into the outer field wide open.
Sliding left and right is also the technique I use if the shift is dramatic. Works nicely most of the time.
This brings me to the off centre focus issue. Technically, if you focus on something pointing straight at it then swing away so it is off centre, the plane changes and so does the required focus distance, but in reality it matters less than you think inless making extreme changes with very fast lenses. it does catch me out once in a while, but so do the off centre focus patches on my EOS! With my 85 1.2L, the centre patch is more reliable, even through recomposition, where the subjects eyes end up 1/3 of the way down a vertical frame, than using the off centre patches. This was messing with my head so I tested it and what do you know? Using the centre patch and recomposing was on average more accurate despite the changed focal plane.
The other issue is that really fast lenses tend not to be pin sharp at the edge of the frame wide open so it is a good idea not to place the subject too far into the outer field wide open.
Sliding left and right is also the technique I use if the shift is dramatic. Works nicely most of the time.