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<blockquote data-quote="Needa" data-source="post: 843384" data-attributes="member: 37799">Welcome!Are you saying that the camera changed shooting modes on you? In shutter priority the camera will try to change the ISO or aperture to meet the shutter speed and exp comp set. Given that your lens is not a fixed aperture the lens adjusts the aperture based on distance, the further you zoom the higher the F-stop number and the smaller the opening so less light entering, the camera compensates by increasing the ISO. If the lens is widest aperture for a given distance the only way to reduce the ISO at that point is to decrease the shutter speed. So yes using a F-4 lens would allow more light and a 2.8 even more at the cost of shallower depth of field. As far as white balance the image posted looks good but it is hard to tell by looking at lights exactly what they are. I have some fixtures that look like florescent but are LED and the the color out put varies. If the same gym you could create a custom white balance. Are you shooting Raw or JPG? Depending on your taste and if you shoot raw noise reduction software might hold some of the answer.</blockquote>

[QUOTE="Needa, post: 843384, member: 37799"] Welcome! Are you saying that the camera changed shooting modes on you? In shutter priority the camera will try to change the ISO or aperture to meet the shutter speed and exp comp set. Given that your lens is not a fixed aperture the lens adjusts the aperture based on distance, the further you zoom the higher the F-stop number and the smaller the opening so less light entering, the camera compensates by increasing the ISO. If the lens is widest aperture for a given distance the only way to reduce the ISO at that point is to decrease the shutter speed. So yes using a F-4 lens would allow more light and a 2.8 even more at the cost of shallower depth of field. As far as white balance the image posted looks good but it is hard to tell by looking at lights exactly what they are. I have some fixtures that look like florescent but are LED and the the color out put varies. If the same gym you could create a custom white balance. Are you shooting Raw or JPG? Depending on your taste and if you shoot raw noise reduction software might hold some of the answer. [/QUOTE]

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