Soldier’s Field is the eight mission in Bioshock Infinite and it has 2x Kinetoscope and 3x Voxophone collectibles. Bellow you will find screenshot guides and explanations on how to find all of them.
As soon as the chapter starts you need to go down a staurcase and turn right, where you’ll arrive at a door, which Elizabeth can lockpick for you. When you enter the room go to the back and across the safe you will find the voxaphone in an open cabinet.
Go right after you descend the stairs after the chapter start. You will come across a scale model of Soldier’s field and the Kinetoscope is in the same room.
As soon as you enter Soldier’s Field park through a gate turn right and next to the Dimwit and Duke Ice Cream building you will find the second Kinetoscope on the boardwalk.
Once you enter Dimwit and Duke Ice Cream Shoppe you will find the Voxaphone on the only vacant table.
Last Voxaphone is located inside the Founder Books store that you can find if you follow the boardwalk. Voxaphone is up above and behind the register, on a shelf.