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New 35-100mm f2.8 and ND filters

Started Feb 27, 2019 | Discussions thread
OP maggiemole Senior Member • Posts: 1,988
Re: New 35-100mm f2.8 and ND filters

Mark9473 wrote:

Could you share a bit more what that Intelligent ISO does compared to the plain Auto ISO?

I'm not the person to explain this properly, Mark, and I hope someone else jumps in! My interest was caught by a discussion (title forgotten)  pointing out that changing ISO does not change exposure, i.e. the amount of light captured, only the sensor's response to that amount of light. Since my habit had been to shoot aperture priority and fix the ISO I was often getting too high a shutter speed to capture just enough light. It just made sense to me to fix both aperture and shutter speed dependent on the DoF I aimed for and recognising the shutter speed needed, and let the camera handle the consequences via ISO. In general, it keeps my ISO lower than Auto ISO does, and I'm hoping that it therefore reduces noise.

Intelligent ISO detects movement - or the lack of it - in the subject and decides that if there is little or no movement it does not need to use a fast shutter speed and so keeps ISO low. Auto ISO simply reacts to brightness and I think it allows for both a varying ISO and a varying shutter speed, which is not likely to be optimum.

I hope I'm right and I hope someone else can add a better explanation.

Maggie

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