sigma art

I have a canon 800D and I am looking at getting a sigma f/1.4 35mm art DG HSM. I have read that this lens works on a crop sensor but does that mean I still times the focal length or will I have the view of 35mm??

I bought one of these docking stations for my Sigma 35mm Art lens. The focal point was slightly off at certain apertures, so I thought it would be easier to buy one of these than to mess around self calibrating in camera. I plugged everything in and updated firmware, then unplugged it and the...