I know sigma is apparently good about recalibrating their lenses for sharpness when quality control is apparently an issue, but how is Tamron? I would like to think my newly purchased 17-50 could be a bit sharper at f/2.8 considering all its hype that I read about, especially considering how nice it gets at F/4.
Does anyone have any experience at all about this? Do they charge anything for this?
Does anyone have any experience at all about this? Do they charge anything for this?