Timeline for Is it focus or depth of field?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 4, 2017 at 23:49 | comment | added | WayneF | The focus point being 1/3 into the zone is true when focused at 1/3 of hyperfocal. This more often applies to landscapes. But it is 50% at macro 1:1 and is 0% at infinity. The OP's group was described as being "very close", so closer to 50% (maybe 45%) is much more likely true. | |
| Oct 4, 2017 at 22:01 | comment | added | Alan Marcus | @ Michael Clark -- I don't know about you, but I surely can spread around the minutia. I do this so much I have a 6th sense (I think I have anyway). | |
| Oct 4, 2017 at 21:31 | comment | added | Michael C | How do you know that? The OP has not given us enough information regarding focal length or the distance of his subjects. It may well be that those closest to the camera are at less than MFD. Until the OP tells us, we don't know that. | |
| Oct 4, 2017 at 21:24 | comment | added | Alan Marcus | @ Michael Clark -- For this situation, DOF is approximately 1/3 towards and 2/3 away from the point of focus. The rest is minutia. | |
| Oct 4, 2017 at 21:06 | comment | added | Michael C | At closer distances DoF is not 1/3 - 2/3, it is closer to 1:1, but it is also incredibly shallow. As you have noted, it is also effectively 1:∞ at or beyond the hyperfocal distance. It's only exactly 1:2 at a specific single distance for a given focal length, aperture, and magnification (enlargement/display size). | |
| Oct 4, 2017 at 18:14 | history | answered | Alan Marcus | CC BY-SA 3.0 |