In my experience and vignetting I have not experienced with my Olympus 3/4 system.
Photoshop 8 is a good one and most 'upgrades'I beleive are marginal for general purposes.
Certainly this has been my experience with its clone Paintshop Pro - whilst extra features abound- non are must haves - just nice to have if you think about using them- which I never do.
Certainly there are Free patches to download I would imagine
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