I have had my Sigma 70-200 2.8 for three bodies now. It was great with my D50, had some metering/focus issues with my D80, and now It seems to be back focusing with my D200. I've been thinking alot lately about selling this lens, the TC and probably the 60 micro to get a 80-200 AF-S. But if it would work right I might just keep it. does anyone have any experience with having sigma lens calibrated? if so what where the cost and wait times? thanks for any info!