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nikon d300 depth of field

Paul Armendarez , Mar 15, 2010; 07:38 p.m.

I just got a nikon d300 and i was messing around with the depth of field button and i noticed everytime i pushed it, the camera view finder turned darker and the camera made a funny noise. Im just wondering if the darker view finder and funny noise is normal or should alarmed. thanks paul

Responses

Lorne Sunley , Mar 15, 2010; 07:46 p.m.

The "depth of field" (preview) button stops down the lens to the f-stop that will be used to take the picture. This makes a sound. The darker view finder is because less light is admitted through the lens when it is stopped down.

David Haas , Mar 15, 2010; 07:50 p.m.

Perfectly normal and expected.

Neil Ambrose , Mar 15, 2010; 07:51 p.m.

That's exactly what's supposed to happen.

When you press the DOF button you're asking the camera to stop the lens down to the set aperture so you can visually check the depth of field. That's the sound you hear. The reason the viewfinder looks darker is because the lens is stopped down to the set aperture so less light is getting in.

Normal operation for the lens is to stay at its widest setting for metering and composing, which is why the viewfinder normally looks brighter. When you take the shot the mirror lifts and the lens stops down to the set aperture so the camera can take the image. But it all happens too fast for you to notice, plus when the mirror is lifted you can't see through the lens.

Hence the reason for the DOF feature. It allows you to view the scene at the aperture you'll be using.

John Williamson , Mar 15, 2010; 11:19 p.m.

If you open the lens all the way up, ( smallest f-stop number ) and press the DoF preview, you will see no change and not hear much at all.

Kris Bochenek , Mar 16, 2010; 07:14 a.m.

nothing to worry about.

Carey Moulton , Mar 16, 2010; 08:53 a.m.

how is the viewfinder screen in the D300? most screens only show an almost constant f4 depth of field, so the preview does not show much change other than to become darker...

Errol Young - Toronto, ON, CA , Mar 16, 2010; 07:36 p.m.

I find the DOF preview to be not that useful even with film cameras. If you stop down enough to make a difference it is too dark to see the results in the viewfinder. With digital, I just snap a pic and look at it.

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