I prefer manual exposure control with my Nikon d300. After setting fston and shutter speed as I wish, the shot is fine. However, the manual setting changes (f-stop in particular) to something completely different after taking shot and I have to enter it again. Not bracketing problem as this is off. I'd like to just be able to set up camera and go. Camera problem or user problem? Thanks
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Turn the aperture ring on the lens to its smallest setting (largest f/number) and then forget it's there. You can control the aperture from the camera body, the same way as on lenses without an aperture ring.
Vivitar makes lenses with a variety of mounts. Assuming the lens in question has a Nikon mount then it will fit perfectly well on a D3000. If the lens has a Canon mount, for example, then it will not fit at all.The lens is a manual focus lens, so autofocus will not work. You'll have to focus by yourself.The lens also lacks the electronics to communicate with the camera. You will have to shoot in the Manual exposure mode, setting the shutter speed and aperture yourself, without any help from the camera's light meter.
Setting it to portrait mode should do it. Hold down the shutter button, it should be working.
I'm not overly familiar with nikons, but otherwise it'll be in a menu mode if you switch it to a more manual setting. Probably under shooting mode. Set it to continuous shoot
Check to see if somehow the "noise reduction" setting is on. This in effect takes two separate exposures on each shutter release, so it (sometimes) doubles the time the mirror is up. I'm not sure where it is in the menus on a D300.
Also, just a terminology point, but the "shutter" in this camera is a combination of the mirror (what we usually call the shutter) and the electronics which samples the sensor for a limited time. It's a little like the mechanical shutter on a film camera that was behind the mirror....back in the day when they made them from titanium.
The "so what" of this is that even if it sounds like it's not releasing as fast as it used to, the exposure can still be accurate if the electronics are sampling correctly. It's only when moving to slow exposures that the mirror speed/up time makes a difference.
likely there's nothing wrong with the D300 - all that's happened is that its inadvertently been set into bracketing mode and hence it cycles through 3 or 5 or 7 different exposures each time it is activated!