Thursday, 21 June 2012

Depth of field

In optics, particularly as it relates to film and photography, depth of field (DOF) is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an
image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the sharpness is imperceptible under normal viewing conditions





There two types of depth of field
The first time of depth of field is :
1.Shallow:  It is when only one thing is in focus and everything else in the background is out of focus. Here is an example of a shallow depth of field.

About the picture: As you can see that everything in the background is out of focus (the second plant, the windows and the wall) and there is only one in focus (the first plant).
I can retake the same picture, because I took care of my position, the shutter, the aperture and the ISO.
Position: This is close up of the plant and some object in the background.
Shutter speed:1/350sec
Aperture: f5
ISO: ISO 200

To improve this picture i thing i should have place the more closer to the plant and leave the aperture up to f/2.
Location: oldham college
These plant' is not more than a meter, so i got closer to them and i tried to focus on the first plant to create a shallow DOF.
Equipments: camera
How to control Depth of Field Distance from the subject to camera.
If closer to the camera then background may appear out of focus (Shallow DOF).

Example: 2
Here is the same picture






Shutter speed: 1/60
ISO: ISO-200
Aperture:F/8

Here you can notice that everything in the background is in focus and the plant in front is out of focus. Don’t worry this as well is a shallow depth of field.


Shutter speed: 1/60 sec
Aperture: f/5.6
ISO: ISO-400
About the picture: it is a keyboard picture. You can see in the picture that almost everything is out of focus and 2, Q, Aand Z are in focus. So a shallow DOF can have one or more things in focus. Most of shallow DOF are obtained by taking a big close of the object (s) or a person (people).
(This picture has three types of composition: Shallow DOF, Repetition and Leading lines.) A shallow DOF can have more than one object or person in focus. This is an example of a bad shallow depth of field because my position was bad while i was taking the picture and the aperture was open up to f/5.6 but i should open it up to f/7 or 8 to allow more light to come in


Pictures (shallow)
I've tried to be more creative by putting a pen lid in the stones to great a shallow DOF





I've left the shutter open for a long time to let (allow) come in. this picture is not edited
ou can notice that the background in the picture is a bit bright.
Aperture: f/8
Shutter Speed: 1/125
ISO: 400
Location: Oldham College
Equipments: Camera , pen lid




If I to compare this picture to that one, it is the same thing but the background is a bit black than the first one. This one is very clear bur the first one.
Aperture: f/8
Shutter Speed: 1/130
ISO: ISO-250
Location: Oldham College
Equipment: Camera, pen lid





2. Wide:
 A picture is said wide, when everything in the picture is not out
of focus but in focus.
These picture can be found i things like: family picture, team( football, basket ball. and etc...)
a park.

Example:
This picture is wide open, every single thing is clear
This is a picture of a garden: you can see that everything is in focus which always you to see really the beauty of the garden.
Aperture: f11
Shutter speed: 1/8
ISO: ISO 220
I like this picture because it's a good example of wide DOF.





This is a bad example of a wide depth of field. because in a wide depth of field we usually want to see everything in it's clearly. to improve this picture i should have change my position so that i could have all the tree i the camera screen.
Aperture: f/11
Shutter Speed: 1/250
ISO: ISO-400
Location: Oldham College
Equipment: Camerea


Remember: The more you aperture is open, the more the picture is blurry.
the problem with this picture is that it's not clear as I've open the aperture up to f/2
to improve this, i should open the aperture up to f/5.6 to have it more clearly.
Aperture: f/3
Shutter Speed: 1/300
ISO: ISO-400
Location:Oldham College
Equipments: Camera

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