Kirk Quick Release Lens Plate for Canon 70-200mm f/4.0, Nikon 200mm f/2.0, Sigma 400mm f/5.6

hey guys Gary here today we're going to be talking about the Sigma 70 to 200 sport ones it is a F 2.8 lens so today we're actually going to be talking about the three function buttons right this specific model we're actually going to be talking about the Nikon model of this ones I know a lot of people have questions about this lens actually searched up all throughout the internet to find answer on how to program these buttons and what these buttons actually do a lot of people come you know searching on YouTube and they leave very confused because they're unsure of functions of these three buttons so I'm actually going to clear that up right now so if you're like me you bought this 7200 and you want to use all the functionalities of this lens and you don't know how to funny how Sigma the great lens manufacturer that it is actually does not come with instruction manuals so I did a little