Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Nikon DSLR Cameras
D7100
Inconsistent Focus Problem on my D7100
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="yauman" data-source="post: 274965" data-attributes="member: 15418"><p>Alright, you are over thinking this <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> At that distance when your little focus square covers the whole face, it doesn't matter if you are focusing on the eye, the nose, the ears or the neck!!! Think of depth of field (DOF) as a percentage of the distance from the subject.</p><p>If you are shooting a face 5 feet away, and the head is a foot deep, focusing on the eye (with a big aperture) will put the ears and maybe even nose out of focus. See the depth of the head is 1/5th (20%) of your distance to the subject. Now, move the subject to 50 feet away - your focus square will cover the face but the depth of the head is only 1/50th (2%) of your distance - so it doesn't matter if you are focusing on the nose or the ears; everything on the face is considered the in the same plane - the fact that the focus square remains the same size is telling you that the camera is focusing on that spot and consider everything inside that square as being on the same plane. There is no lens with that shallow a DOF at that distance! Now, if you zoom in and now your subject's face is closed enough that your focus square is the size of the eye, focus on the eye - your DOF at the zoomed in distance is shallow enough to make a difference between focusing on the nose or the eye or the ear - so that face that the little focus square stay the same size is by design and a good thing!</p><p>Hope that makes sense.</p></blockquote><p></p>
[QUOTE="yauman, post: 274965, member: 15418"] Alright, you are over thinking this :o At that distance when your little focus square covers the whole face, it doesn't matter if you are focusing on the eye, the nose, the ears or the neck!!! Think of depth of field (DOF) as a percentage of the distance from the subject. If you are shooting a face 5 feet away, and the head is a foot deep, focusing on the eye (with a big aperture) will put the ears and maybe even nose out of focus. See the depth of the head is 1/5th (20%) of your distance to the subject. Now, move the subject to 50 feet away - your focus square will cover the face but the depth of the head is only 1/50th (2%) of your distance - so it doesn't matter if you are focusing on the nose or the ears; everything on the face is considered the in the same plane - the fact that the focus square remains the same size is telling you that the camera is focusing on that spot and consider everything inside that square as being on the same plane. There is no lens with that shallow a DOF at that distance! Now, if you zoom in and now your subject's face is closed enough that your focus square is the size of the eye, focus on the eye - your DOF at the zoomed in distance is shallow enough to make a difference between focusing on the nose or the eye or the ear - so that face that the little focus square stay the same size is by design and a good thing! Hope that makes sense. [/QUOTE]
Verification
Post reply
Forums
Nikon DSLR Cameras
D7100
Inconsistent Focus Problem on my D7100
Top