D200 how to avoid over-exposure ?

Started May 26, 2006 | Discussions thread
tnielsen Regular Member • Posts: 372
Re: Spot meter on highlights

Hi Stefaan

Let's for a moment assume we are talking B&W-photography

18% grey is the tone lightmeters are calibrated to "seing". What this means is that if you point your camera towards a white piece of paper covering the whole field of view, and let the light meter decide on exposure, the resulting image will be 18% grey - sort of medium grey. If you do the same with a piece of dark grey paper, the same thing happens: The image will turn out 18% grey. The lightmeter measures light reflected from the scene and has no chance knowing whether the scene is dark and well-lit or light and poorly lit. Does this make sense?

Now if you spotmeter from the brightest part of your scene, the camera will set exposure as to make the highlights 18% grey. If you overexpose by one step, highlights will by rendered "one step lighter" than 18% grey .. and so on. On the D200 an overexposure of 2.7 steps will render highlights completely white - on the verge of blowing. There is nothing physical about 2.7 .. this is just how the sensor in D200 behaves .. on the D70 it was more like 2.3

At higher ISO-settings the dynamic range of the D200 decreases and you reach the point of blowing highlights sooner.

I hope this made a bit more sense

best regards

 tnielsen's gear list:tnielsen's gear list
Nikon D800 Sigma 150-600mm F5-6.3 DG OS HSM | S +9 more
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