Focus stacking (Photoshop)
With focus stacking in Photoshop you combine several shots at different focus points into one image that is sharp everywhere. Photoshop aligns the layers and automatically blends only the sharp parts from each shot. It is the technique for macro and landscape where depth of field falls short.
Load your series as layers via File, Scripts, Load Files into Stack and tick the align option. Select all layers, choose Edit, Auto-Blend Layers and set the option to Stack Images. Photoshop masks the sharp areas per layer and merges them into one continuously sharp image. Tip: shoot your source frames from a tripod with fixed exposure and small focus steps, so the stack blends flawlessly.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.