Manual exposure on D300 Nikon

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

A plus-or-minus one-third stop is perfectly normal if you're handholding the camera, especially when metering a high-contrast subject such as a lit lamp. If you really need to lock the exposure, use the exposure-lock button or set the camera to manual.

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.

are you using mirror lock-up or live-view feature?

Perhaps it is a focusing problem- try it on manual focus setting to see if the problem still persists...

lawsuit, take them to small claim court, Nikon will settle...

Some cameras have a slower shutter speed setting that will give you this affect. A tripod will be needed as shooting at slower speeds can cause blur from a shaky hand.

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!

go to the custom settings menu, then section "e"..number 5, auto bracketing set, choose AE only.

Then go to F4...assign func button, for func buttons + dials...choose Auto bracketing.

Then when actual shooting, press and hold the func button and rotate the main dial to choose number of frames...func button and sub dials to choose the difference in exposure.