One of the things that must be done when you want to make 360 photograpghy is to calculate the field of view. Because 360 ??° photos are made from pieces of united images, we have to know how many pictures we have to take using the cameras and lenses we have. The larger the sensor and the smaller the mm lens, the fewer images we need. The top picture I took using the Canon Powershot SX40 (24mm equivalent) and requires 29 images. If you use a full frame camera like Canon 5D, 1DX, Nikon D800, D600, D4 etc. and use an 18 mm lens kit, the number of images needed is less, namely 14-16 images.
The most “deadly” thing is if you use a full-frame camera combined with a fish-eye 8mm lens, then only 4 images you need. Why is that? because each alloy lens and camera will produce different fov. The real calculator is only for calculating for ordinary panoramic photos (not equirectangular) but comfortable enough to calculate the fov and the number of photos needed to make an equirectangular photo.
After that, you can start searching for non-parallax points. The no-parallax point is also known as the entrance pupil, although many people mistakenly call it a nodal point. This no-parallax point is very important for taking 360-degree photos so that there is no difference in perspective between one and the other images. Each lens and camera have different parallax points.
When you want to take a picture, you can do this. The first time you have to know, to take pictures for this 360 panorama is that your camera settings must be full manual. Shutter, diaphragm (lens opening), ISO and white balance must be set manually. Even sometimes you have to use manual focus to maintain image quality. Why should it be manual? Because if you set Auto or Program mode or other then the camera will adjust the exposure of each shot.