My Nikon D90 is very slow when taking a picture in manual mode (S, A, M ) , all 3 of them. I make sure that my pointer is in the moddle for right exposure.

When i use AUTO mode it works fine. I tried resetting all the setting but doing the same thing. I tried all 3 of my lenses, same result. My lenese works fine on other cameras. What could be the problem ?

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    Slow how? Long exposure time? What are the ISO setting and aperture? – xenoid Oct 21 '19 at 15:56
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    M is Manual, S & A use some automation. Does the D90 not show you the relevant ISO, Aperture & Exposure time in the viewfinder display before you take the shot? Is your lens struggling to focus? You haven't adequately explained what you mean by 'slow'. – Tetsujin Oct 21 '19 at 17:04

When you use "Auto" mode the camera is probably automatically boosting the ISO to allow for an exposure time that it thinks is appropriate for whatever focal length you are using. For instance, if you are using a 50mm lens and the aperture is already wide open, it might boost the ISO until a "proper" exposure can be made with a shutter time no longer than 1/50 sec.

When you use S, A, and M exposure modes, the camera is likely assuming you understand what you are doing and are intentionally selecting ISO and aperture values to give you a longer exposure time. So it does not boost your selected ISO setting.

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