I recorded a series of videos for Sigma America and they have them in their youtube channel, but somehow they’re unable to upload them in higher quality so I uploaded...

I recorded a series of videos for Sigma America and they have them in their youtube channel, but somehow they’re unable to upload them in higher quality so I uploaded them myself – although without their intro. You have to imagine it. :)  I hope you find something useful and don’t forget to watch in HD!