If you used a longer flash zoom like 105mm then the light from the flash will be more concentrated and you will have more of a spotlight effect. Let’s assume you have the flash set up on the camera and it is facing directly at the subject. If you are shooting a scene with a lens with 50mm focal length then you would probably want your flash zoom to be set to 50mm too. Since it works alongside focal length, the flash zoom is necessary so that you don’t waste light from your flash. On the other hand, if you are using a wide angle / low level of zoom like 24mm then the flash head is closer to the front of the unit so the light immediately gets dispersed in a wider angle as it leaves the unit. This means that the light rays are more directed in a straight and narrow fashion. If you are using a narrow angle / high zoom like 105mm then the flash head will be further back in the unit. The zoom setting changes based on where the position of the flash head is within the unit.
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