Hello, the entrance can be paid there at the moment or do you have to buy the ticket in advance ???

If you can buy it when you arrive. But there is a long line to buy only the ticket to access the Skydeck. My recommendation is to buy the famous City Pass if you are going to be there for several days and save and take advantage of it. Also, if you are on a budget, I would recommend doing the Chicago 360 instead of the Skydeck, as it is newer and has a greater attraction. I only did the Skydeck and I liked it a lot, but the line was almost 2 hours and for what you see it is not a big deal.

Yes you can at the moment but I recommend you online there is an exclusive line

Cristina Gonzalez... I just want to go to the Skydeck and the Beans for only two days...but I want to know if with the regular ticket of $24 you can take photos and others...