05-13-2011, 11:28 AM
[quote name='Klaus' timestamp='1305278671' post='8286']
PD AF is also performed at max. aperture so it is vulnerable to focus shifts when stopping down (residual spherical aberration).
[/quote]
Contrast AF isn't necessarily immune to focus shift either, although right now it is theoretical than practical. Maybe the Panasonic implementation is different, but on Olympus it feels like it uses the widest aperture during AF while maintaining a reasonable exposure.
Taking a step back, given that Panasonic use contrast AF, it is in their interested to promote the possible advantages that gives, while they may play down or ignore any disadvantages in the marketing material. Personally I don't care what the method is, as long as it is fast enough and accurate enough.
Fuji used a hybrid method of both phase and contrast (both on sensor) in some of their recent compacts, although they have a lot of work still to do based on reviews. It could be one future path for the best of both worlds though.
PD AF is also performed at max. aperture so it is vulnerable to focus shifts when stopping down (residual spherical aberration).
[/quote]
Contrast AF isn't necessarily immune to focus shift either, although right now it is theoretical than practical. Maybe the Panasonic implementation is different, but on Olympus it feels like it uses the widest aperture during AF while maintaining a reasonable exposure.
Taking a step back, given that Panasonic use contrast AF, it is in their interested to promote the possible advantages that gives, while they may play down or ignore any disadvantages in the marketing material. Personally I don't care what the method is, as long as it is fast enough and accurate enough.
Fuji used a hybrid method of both phase and contrast (both on sensor) in some of their recent compacts, although they have a lot of work still to do based on reviews. It could be one future path for the best of both worlds though.
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