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I've been using manual focus lenses. In a few cases, I wanted to be in a picture, but it takes too long to explain how to focus. Even people who have used manual-focus lenses in the past, who should know how to focus, can't get it right. Is there a setting or technique I can use to get correct focus when handing the camera off to someone else?

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    Give them your phone instead :-) – Philip Kendall Apr 2 at 6:37
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    @PhilipKendall - You mean... My phone takes pictures? 😲 – xiota Apr 2 at 6:42
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    Honestly, I run into this same issue with AF lenses because I've got my slr set up with bbf. Even when you tell someone to use the thumb button for focus, they just don't get it. – Hueco Apr 3 at 19:26
  • Focus peaking on a DSLM can usually be explained to laymen - the much more difficult thing is explaining spot+AEL metering (if you do not want to reconfigure the metering mode since you are damn likely to forget undoing the change). – rackandboneman Apr 4 at 8:14
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You've probably already figured out that you should prefocus, and don't mention that it's manual focus or you risk having it changed inappropriately. But the camera is changing hands, and people are moving about, so how do you get the focus right?

This is where your knowledge of depth of field comes in. Stop down the aperture until you're reasonably confident that you'll be within the depth of field when the shutter is fired. Consider using a stop smaller than you think you'll need. If you really have no idea and lighting is good, try the hyperfocal distance at F8.

With less lighting, such as indoors, you should still attempt to prefocus and stop down the aperture, but you'll be limited by ISO and shutter speed. In these cases, if you increase distance and decrease focal length you can further increase depth of field. You can always crop later, provided the image is acceptably sharp.

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    But always keep the shutterspeed in mind when stepping down the aperture because people who are not photographing often may have shakier hands because of a wrong grip or wrong less stable stance. – LuZel Apr 2 at 6:31

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