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<blockquote data-quote="BackdoorArts" data-source="post: 98448" data-attributes="member: 9240">You don't check anywhere but at minimum, which is where you have the smallest depth of field (the area that will be in focus).&nbsp; As you raise the aperture the depth of field grows.&nbsp; So if you start at F2.8 and move to F4.0, you should see no change to the areas that were already in focus, only added areas to both the front and rear of the previous shot.&nbsp; At F8 and F16, you have a wide depth of field, so it's impossible to determine whether the point the camera chose to focus on is dead center in the field, or to the front or rear of that point.&nbsp; Whether the depth of field grows uniformly to the front and rear of the focal point as you change the aperture, I couldn't tell you - I love physics, but I know only enough about optics to sound like I might know something.&nbsp; Suffice it to say, that's what the depth of field preview button is for - once you've locked your focus on your primary subject, does your aperture setting set include/exclude the other items in the photo in the way you want?</blockquote>

[QUOTE="BackdoorArts, post: 98448, member: 9240"] You don't check anywhere but at minimum, which is where you have the smallest depth of field (the area that will be in focus). As you raise the aperture the depth of field grows. So if you start at F2.8 and move to F4.0, you should see no change to the areas that were already in focus, only added areas to both the front and rear of the previous shot. At F8 and F16, you have a wide depth of field, so it's impossible to determine whether the point the camera chose to focus on is dead center in the field, or to the front or rear of that point. Whether the depth of field grows uniformly to the front and rear of the focal point as you change the aperture, I couldn't tell you - I love physics, but I know only enough about optics to sound like I might know something. Suffice it to say, that's what the depth of field preview button is for - once you've locked your focus on your primary subject, does your aperture setting set include/exclude the other items in the photo in the way you want? [/QUOTE]

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