When ever i zoom my lens the aperture is also adjusting automatically even though i use manual mode.
SOURCE: Why won't my aperture go lower than 5.6?
You do have total control, within the constraints of the hardware. The 18-55mm lens has a maximum aperture range of f/3.5 to f/5.6. This means that at 55mm the maximum aperture is f/5.6. You can go the other way, all the way to f/38. At shorter focal lengths you can open up as far as f/3.5.
If you want a larger aperture, you'll have to get a faster lens. For example, Nikon has a 17-55mm f/2.8 lens which has a maximum aperture of f/2.8 at all focal lengths. It also costs $1300 new.
SOURCE: aperture cant be changed on manual mode
Maybe a lens problem. Try to re-seat the lens and play with the Aperture test button on the right side of the camera (near your right finger)
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