Depth of Field (DOF) Most photographers understand the wider or the smaller the f/stop you use will blur the background or sometimes call bokeh. DOF can also be accomplished by a long focal length. This was shot at 270mm. f/6.3
Bokeh is different though, it is the quality of out of focus areas. Most easily seen in out of focus point sources of light, you can have a pleasing evenly lit circle or a harsh,edgy, rim lit circle.
Coker wrote:
Depth of Field (DOF) Most photographers understand the wider or the smaller the f/stop you use will blur the background or sometimes call bokeh. DOF can also be accomplished by a long focal length.
as well as magnification and distance to the subject. Closer subject or higher magnification = shallower DoF.
Bigdaver wrote:
Bokeh is different though, it is the quality of out of focus areas. Most easily seen in out of focus point sources of light, you can have a pleasing evenly lit circle or a harsh,edgy, rim lit circle.
I was surprised to see lens reviews that commented on the quality of the out-of-focus background.
jerryc41 wrote:
I was surprised to see lens reviews that commented on the quality of the out-of-focus background.
It has become a hot "gotta have it" item - like in-camera HDR and a few other things.
BboH
Loc: s of 2/21, Ellicott City, MD
To put it into slightly different words - focal length is immaterial - DOF is created by the F stop
BboH wrote:
To put it into slightly different words - focal length is immaterial - DOF is created by the F stop
I wish it were this simple. The those who are of the technical nature, here is a great site with the basic DOF equations:
http://www.dofmaster.com/equations.htmlIf you keep a few things constant such as 'focus distance' and 'focal length', then adjusting the F Stop will create the greatest change in the DOF.
"Affecting DOF are camera-to-subject distance, lens focal length, selected lens f-number, format size, and circle of confusion criterion. The combination of focal length, subject distance, and format size defines magnification at the film / sensor plane."
And don't let anyone tell you otherwise.
jerryc41 wrote:
haroldross wrote:
BboH wrote:
To put it into slightly different words - focal length is immaterial - DOF is created by the F stop
I wish it were this simple. The those who are of the technical nature, here is a great site with the basic DOF equations:
http://www.dofmaster.com/equations.htmlIf you keep a few things constant such as 'focus distance' and 'focal length', then adjusting the F Stop will create the greatest change in the DOF.
There is also a DoF app.
quote=haroldross quote=BboH To put it into sligh... (
show quote)
An app for an ANDROID ? ? ?
DOF lessons were being provided on the site titled "Rockin On" or some such thing. They were up to Lesson three then it just disappeared. Here as well as on the Forum UHH" site. Anybody know what happened? I actually made a folder on my MAC to keep the stuff going back n forth but then that stopped coming. Help.
It really boils down to the actual size of the hole the diaphram makes, your tolerance for circles of confusion, and focus distance.
BboH
Loc: s of 2/21, Ellicott City, MD
imagemeister wrote:
It really boils down to the actual size of the hole the diaphram makes, your tolerance for circles of confusion, and focus distance.
Thanmk you - what I did not say as well as you
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