An f/1.8 max aperture lets in plenty of light, so you can stream from dimly lit environments and still have watchable footage. It also has an ND filter for overly bright situations, giving you a more evenly balanced exposure with no blown out highlights. The autofocus is the most advanced...
Streaming on Twitch is free, but if you're serious about it (or want to make some money from it) you're going to need to invest in some extra equipment to make your stream more watchable. This list is by no means mandatory or exhaustive, but in my experience these products make all...