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This page lists the camera settings to check before securing the camera inside the camera box.
The settings mentioned here are specific to Canon EOS 2000D/Rebel T7. Look for the corresponding settings if you are using a different DSLR camera.
On the top of the camera is the Mode Dial wheel, which should be set to M for Manual mode.
Available via the Menu button.
Set to manual focus.
The aperture for the camera should be set at 1.4, or all the way "open," in order to catch as much light as possible. Once set the aperture should not have to change.
The video below describes both the setting of the aperture and how to focus the camera.
Once the lens aperture and focus are set, carefully place the lens band to avoid focus creep over time. The lens band should stretch partially over the focusing ring and a static part of the lens, as shown below.
Prevents any stray light from leaking into the viewfinder.