How Do I Select The Right Camera Zoom For Crop Sensor Cameras? This isn’t so much of a problem if you have enough light, but this can be important especially if you are only just getting enough light in your scene with the flash. If you used a wide flash zoom like 24mm then you would be illuminating an area larger than the area captured by the lens so you will be wasting some of the flashes power on illuminating things which are not in the scene. The edges of the scene will be much less illuminated and this can look unbalanced – unless that’s the look you want to go for. 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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