Once inside, plan on walking a LOT of steps with 2,500 of them available in 154 flights connected to 80 landings. Even when circling the Vessel at the same level, one must go down and up stairs almost continuously.
From a compositional perspective, the higher the shooting position (the more stairs you climb), the more that stairs and landings are seen in the compositions (as you are inclined to shoot more downward at higher levels). The lower the shooting position, the more that the copper color and reflections tend to be seen. The hexagonal shapes created by the flights of stairs and landings appear largest when photographed with a level camera. A wide range of focal lengths can be used, but ultra-wide-angle focal lengths are really fun to use here. The 15mm focal length was not too wide and I would have used wider if I had it available (the Canon EF 11-24mm f/4L USM Lens would be especially fun here).
Note that this is a "Tripods and selfie sticks are not permitted" location. I didn't have a problem with the selfie stick limitation but would have much appreciated having a tripod to work from. A small amount of (sloped) space available on hand rails enabled use of a Really Right Stuff TFA-01 Ultra Pocket Pod and that along with a BC-18 Microball worked very well, though very close attention was required to ensure the rig did not tip over the edge. There is a conventional round handrail throughout the structure, but it is lower than the sloped edge rail, making the RRS clamp I had along unworkable due to the obstructed view.
I love symmetry in compositions and while this structure makes symmetry available, it is a challenging pursuit. My advice is to frame the scene as symmetrically as possible or make it look like you didn't try to do so. Either can look great, but a nearly symmetrical image can appear sloppy. Centering the camera on a landing (watch the floor and railing tiles for centering clues) and ensuring that it is level is a good start to obtaining symmetry. Fine-tuning may still be required and even if great care is taken in the field, fine-tuning may still be required during post production.
This location can be photographed at any time of the day. However, the later the night got, the more I liked the results. The black sky allowed reflections on the structure to pop. Aircraft (a police helicopter is landing in this image) and vehicle lights can be streaked through the frame after dark. Fewer people were visiting and the longer exposures permitted by the darkness allowed the people still there to be erased via their movement. Using strong ND filters is a good mid-day option for obtaining long exposures. Especially on the higher levels, there are vibrations from people walking, especially when going up and down stairs. Long exposures can be surprisingly sharp when the vibrations are a short percentage of the overall exposure.
Another strategy for removing people from the composition is to capture multiple images, later blending them to show portions of the frame without people. Perhaps visiting on a bad weather (think cold, rain, etc.) weekday might gain solitude. Additional options include embracing the naturally occurring people and taking someone along that you want in your photo (environmental portraits).
If the sun is visible, capture it peeking through the structure using a narrow aperture to create a star effect (wide aperture lenses often work best for this). I planned to capture the sunset in the background on this afternoon but ... heavy clouds canceled that show.
The elevator rails will likely end up in your wide-angle images, so use them compositionally. Try centering the rails and also angling them through the side of the frame. Observe the buildings in the background varying as the structure is circled. Give consideration to what they look like in the composition. The blue lights shining upward from the bottom of the structure can be utilized in the frame. In this case, a narrow aperture turned them into a rather wild-looking bright blue star.
I managed to spend 4 hours at the Vessel before a phone call pulled me away from the fun. The take-home from this shoot was very good and it was difficult to select one image to share.
The image I've chosen here simply would not be the same if captured at 16mm.
I carried the Canon EOS R and RF 15-35mm F2.8 L IS USM Lens, the only combination I ended up using,
along with some other options in a MindShift Gear BackLight 18L.
This backpack was perfect for this need.