Because we are not all professional photographers, we make mistakes and even pro can fail, nobody is perfect, isn’t it ?
Beyond the basics of managing well shutter speed level to avoid blur when you do not want any, in some circumstances, it can be difficult to avoid blur even when you are not a beginner.
One can argue it is easy to delete these images when you download your photo session images. And this is true. At the same time, culling images is not – on my opinion – something so exciting and I have wished for a long time that some part of the culling process could be automated. Culling blur images being one of the features I have been looking for. Let’s come back to blurred images:
First case, when there is not enough light. To find the right balance between noise (or blur after noise reduction) from high iso, shutter speed at the level needed, too much underexposure or the wrong depth of field (too little): that’s typical of low lights shooting.
Second case, out of focus can still easily happen even with top notch autofocus in 2020 (e.g. during a wedding, or kids playing, or wildlife like birds, … ). The more people / subjects moving, the faster they move, and the more challenging it can be. Expect some images to be blurred.
And both can be combined of course. Shooting moving subjects in low lights is going to maximize the chances of failing. As a conclusion, blurred images are not what you wanted, but it is what you got.
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