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Canon T4I - Wont take pictures of pure white paper

Started Feb 28, 2022 | Questions thread
Aoi Usagi Veteran Member • Posts: 3,221
Re: Canon T4I - Wont take pictures of pure white paper
1

Ray UK wrote:

If you are looking for dust on the sensor then focus doesn't matter. Set the camera to M or AV. Set the lens to manual focus at the smallest aperture (f22) with a very slow shutter speed, position the camera pointing at a white sheet of paper so that it fills the image, press the shutter speed and move the camera whilst the shot is being taken.

The slow sutter speed and moving the camera will blurr out any marks or reflections on the paper, the small aperture will make any dust marks more obvious.

I will say it again "Focus doesn't matter" and the best results will be obtained when the lens is way out of focus.

This depends on how you want to search for the dust. In my post I stated that focus to MFD and shoot the sky, aka something far away. This blurs out any objects that may appear to be dust, like aeroplanes, flies, birds etc. This makes it easier to see dust in this particular way. Setting focus at infinity may show these objects, which may appear as dust. Setting Shutterspeed in this case, does not matter, as long as it is properly exposed. Your last sentence is a bit odd. You say "Focus doesn't matter" and then state "best results will be obtained when the lens is way out of focus". Well than the focus does matter a little, doesn't it.

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