Another D3s vs D3 advantage: The Auto ISO with flash difference

Started Dec 5, 2009 | Discussions thread
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teodorian2
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Another D3s vs D3 advantage: The Auto ISO with flash difference
Dec 5, 2009

If you use flash combined with Auto ISO on the D3 and the D300 the result is that the flash light is increased first to max before the ISO value goes up. As a consequense this often give underexposure (if you use a to low ISO value in low light) and that the main subject in the foreground - a person for example - will become much lighter than the background.

Now with the D3s and the D300s photographing indoors in low light using Auto ISO and a speed light like the SB-900 you can blend ambient light and flash light in a more balanced way.

You can direct notice the difference since on the SB-900 LCD used on the D3 it reads the choosen ISO and for instance TTL BL FP but on the D3s it reads ISO Auto TTL BL.

Here is a side by side comparison with SB-900 and the same shutter speed (1/15s), aperture (f2.8) and choosen ISO (400) in all three examples. First the D3, Auto ISO limit ISO 1600 resulting in an ISO 400 exposure; then the D3s with the choosen limit ISO 400 resulting in an ISO 400 exposure and last the D3s with limit ISO 1600 given me an ISO 1600 exposure with more ambient light blended in. The difference here may look subtle but it is anyway obvious how different Auto ISO and flash now works on the D3s compared to the D3.

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