Question about Nikon 20MM F2.8 AF NIKKOR Lens

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Consistent under exposure

Using a this lens on a D80, indoors, studio lights. Consistently under exposes get better picture by +.3 to +1.67 exposure vs. auto on the aperture priority. The lens is new. Should I use it or should I work w/ Nikon on a replacement? Have you heard this a common problem with this lens or combination of lens and d80?

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  • TCWphoto Dec 23, 2007

    We have the K set at 3200, as measured by someone before me. I always get confused on the +/- sorry for error in previous post. We do not use the flash. In any event, we're moving the lights around to get the best color possible. I've learned that light colored objects might be 1.3 to 1.6 underexposed and dark colored objects about .3 over exposed so I think the lens is off a little.

    I have not gone to manual, maybe should try. We had been using old non-digital lenses with manual and manual focus. The new auto focus is getting the detail so much better (these are small to large textile objects and we need the detail to see the before/after conservation). I guess I could try manual settings w/ auto focus, we've learned to +/- expose and that's working ok.



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Under exposed should be minus not plus number.
Lucky you didn't buy Canon 5D or 1D- they have focus and exposure problems.

Hope you are not using the pop flash that is on the camera. If you are, then turn off the Red Eyes Modes.
Set camera to manual mode and lower the F number(open up to half or one stop).

What studio lights are you using? Increased the light output of studio by those number and shoot like you normally do.

Posted on Dec 23, 2007


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Hi, My Nikon D80 is now kaing over exposed

This can happen if you have ISO control set to Auto and have spot metering selected, especially if it's set to spot shadow or spot highlight. Over exposure probably means it's set to spot shadow metering.

With spot metering the camera measures exposure from just a very small point in the scene, and so slight camera movements will cause the metering spot to wander onto different exposure settings very easily. If the camera is either set to use restricted apertures or shutter speeds due to program or lens limitations then it will compensate by adjusting the ISO settings instead

Never use auto ISO, just choose what you need for the conditions rather than using the camera's best (& usually poor) guess. Alsonever use spot metering unless you know why you're using it. The default multi-pattern metering is extremely accurate for most situations.

Please check the camera settings based on what I've said, if it fixes your problem then please rate my answer. If not then please add further details of which lenses and camera settings you're using and I'll try to help you further.

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