When shooting flowers and wanting the surrounding flowers, leaves and background blurred, I use Single Point A-F. Recently, I changed to 9 point dynamic-area AF in order to get all the surrounding flowers in focus. I did this by holding down the AF button and rotating the sub-command dial to d9. Nothing changed - the images after the change were the same as before the change, i.e. just the one flower in focus. I was in AF-C focus mode and I re-focused after the change. Would someone please tell me what I did wrong or is this a camera issue?
also, note, that as you increase your aperture, you shutter speed will decrease... so, adjust your ISO in keep you shutter speed to the a value that will be useful. unless you are using a tripod.. and absolutely no wind.
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The camera can only focus on one subject at a time. Dynamic Area AF was designed to be used when you are tracking a moving subject that is difficult to keep a single AF point on. With 9 active AF points, the 8 AF points surrounding the active (highlighted) AF point are used to keep the moving subject in focus. As stated above, if you want more Depth Of Field (DOF) you must use a smaller aperture (larger f/#) or when shooting at or near macro distances use focus stacking in PP. Good Luck and Enjoy your Nikons!
Thanks for the aperture refresher, but I am referring to, for example, three flowers - all along the same plane (or very near the same). With single point focus, I get one in focus and the other two out of focus. I was thinking that if I expanded the focus point to 9, 21 or 51, all flowers along the same (or similar) plane that fit inside the focus area (9,21,51) would be in focus. I know I'm missing something.
Glenn, You're not increasing the focus point by going to multiple points. You can have a 1000 focus points and that one flower will still be the only one in focus if you don't stop down the lens. A lens can't focus to two points at the same time, only one. But as you increase the dof by stopping down the lens the area of acceptable focus becomes larger.
Think of it as a Focus Plane. If you use one sensor and put it on the desired subject, the entire plane will be in focus and whatever depth of field you chose will determine how much in focus nearby areas are. If you use more sensors, the camera may have more subjects to choose from, but it can just select one focus plane. The camera might have a difficult time on your primary subject and choose something close under an adjoining sensor. But it cannot focus on more than one plane at a time.
Multiple exposures or focus stacking can be used to focus on more than one point in an image.