Can it be "when taking the shot" instead here?
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Native speaker’s answer
Rebecca
Good question! You could say it, but it would imply something slightly different. Here, "to take" means the possible moment of taking a picture, whereas "taking" would mean within the process and action of taking a picture. So, if they said "when taking the shot," it would mean that while they were taking the shot, they weren't sure about something. "When to take a shot" means the right moment or time to execute the action. Ex: When editing photos, I like to make sure it's the right size first. Ex: I never know when to edit photos during the week. Ex: I hit my head when I was walking downstairs. Ex: I'm not sure where to walk so I can avoid the puddles.