Photos Perspective (Depth of Field)

dsutton24 said:
I believe what you're illustrating is neither perspective nor depth of field, but rather depth of focus.
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Depth of field definition -
Depth of field is the distance between the nearest and the furthest objects that are in acceptably sharp focus in an image
en.wikipedia.org

Depth of field - Wikipedia

en.wikipedia.org en.wikipedia.org
Depth of field defines the focal plane of the current lens settings....or vice versa.....they are pretty much the same thing....
 
Arathol said:
Depth of field definition -
Depth of field is the distance between the nearest and the furthest objects that are in acceptably sharp focus in an image
en.wikipedia.org

Depth of field - Wikipedia

en.wikipedia.org en.wikipedia.org
Depth of field defines the focal plane of the current lens settings....or vice versa.....they are pretty much the same thing....
Click to expand...

Depth of field describes an object that is in focus along with some distance of either its foreground or background or both. Depth of focus is a situation where the object is in focus, but substantially neither the foreground nor the background are.
 
An absolute great thread. Perspective shots of our tools are some of my favorites. I always enjoy seeing everyone’s incredible photography and drawing inspiration from your photos. Our phones definitely take some great pictures and a little editing to bring out the colors goes a long way. Here’s three from me

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dsutton24 said:
Depth of field describes an object that is in focus along with some distance of either its foreground or background or both. Depth of focus is a situation where the object is in focus, but substantially neither the foreground nor the background are.
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Yes, thats what I said.....What you are saying is more or less the same thing....If your depth of field (the distance between the nearest and furthest objects that are in acceptably sharp focus in an image by definition) is say less than 12", then there won't be much else in focus in front or behind the subject......An image with only the subject in focus is usually said to have shallow depth of field. See the link in post #2 concerning actual depth of focus.......
The pictures I posted above were done using a Pentax Kx using an old Asahi Pentax-M 50mm manual lens set at f2 (wide open) with a 1/2500 shutter speed to get a very shallow depth of field.
 
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Depth-of-field and depth-of-focus are my favorite aspects of photography. Notwithstanding that I've attached quite a few photos wherein those aspects are underscored, I was a little sheepish to admit how miniscule of a portion of my knife photostream that they represent:

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This one wasn't really on purpose, rather to capture the swedge-ing I applied to one of my Navy Knife/Lambsfoot mods, but it turned out a most demonstrative example of the effect:

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I'll bet that Chief Chief and pistonsandgears pistonsandgears might have a nice DoF shot or several to share. Also, huntnfishin huntnfishin aren't you a photography teacher?
 
The amount of your photo in focus is what I call depth of field. Amount of depth of field is affected by three things, the focal distance of your lens (wide angle has more in focus than telephoto), the f-stop your lens is set to expose (higher f-stops have more in focus), and the distance to your subject (further from your subject has more in focus). Quality of bokeh is determined by lens design, some bokeh looks busy, other bokeh is nice an creamy. Having objects near, midrange, and far give scenic shots dimension.

longexposurewater-2.jpg
 
Chief said:
The amount of your photo in focus is what I call depth of field. Amount of depth of field is affected by three things, the focal distance of your lens (wide angle has more in focus than telephoto), the f-stop your lens is set to expose (higher f-stops have more in focus), and the distance to your subject (further from your subject has more in focus). Quality of bokeh is determined by lens design, some bokeh looks busy, other bokeh is nice an creamy. Having objects near, midrange, and far give scenic shots dimension.

longexposurewater-2.jpg
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Thanks for the knowledge, I love that I can always learn something new. I also appreciate your photograph, it looks fantastic. Somehow that looks better than real life.
 
Let'er Buck said:
Thanks for the knowledge, I love that I can always learn something new. I also appreciate your photograph, it looks fantastic. Somehow that looks better than real life.
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You are welcome sir. Taken somewhere in Rocky Mountain National Park, 35mm, F16, used a tree for a makeshift tripod to accomplish the slow shutter speed, around 2 sec IIRC, makes the water look silky as the water is moving while the shutter is open. No filters. I shoot knife pics with a 100mm macro lens because it has built in image stabilizing which allows me to not use a tripod. Shallow DOF really works well with portraits, makes the subject jump out. Here is an example of shallow DOF 50mm F1.4.

dof.jpg


dofexample.jpg
 
The iPhone has an interesting feature where it takes pictures with deep subjects in two shots and then combines them to create an image that is sharp from front to back.
 
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