Focus changes with temperature. The method you're using is unlikely to give good results.
Generally to get the file size down and display the full image, we use a combination of reducing the pixel dimensions of the image and JPEG compression.
Look for something called image size in the menu to resize the image then save as will give you a compression number, usually 1-10 or 1-12 or a percentage.
On this occasion however to assist diagnosis, I suggest you try just cropping the image so that we can see the fully magnified golf balls.
Joe
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