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FORUMS Photography Talk by Genre Nature & Landscapes Talk 
Thread started 17 Jan 2012 (Tuesday) 08:51
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help depth of field

 
mskat
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Jan 17, 2012 08:51 |  #1

I am having a little difficulty grasping the concept of depth of field- what's sharp and what's not. I understand that an aperture of say f4 creates a shallow depth of field. An aperture of say f11-f16 would create a greater depth of field. But my confusion comes in here. Taking a landscape shot I want as much of the foreground, middle and distance to be in focus. What should I focus on? If I focus on something in say the middle, a tree for example wouldn't that make everything else out of focus? Would the best method be to shoot in manual? My eyes are not terribly good, so could I set the camera to auto and then switch over. I have attached an image, but it still leaves me pondering the question of what will be in focus if I focus on the tree.


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DunnoWhen
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Jan 17, 2012 09:03 |  #2

What you need to do is read up on Hyperfocal Distance.

It is defined as the minimum distance at which one can focus such that from half the hyperfocal distance to infinity will be within “acceptable focus”.

It is a function of the focal length and aperture.

For example f11 at 25mm gives a hyperfocal distance of 9.6 ft and therefore a DOF of 4.8ft to infinity.

Therefore, focussing at/beyond 9.6ft will achieve what you are looking for.

There are a plethora of threads on the forum about Hyperfocal Distance.


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patman530
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Jan 17, 2012 09:03 |  #3

http://www.cambridgein​colour.com/tutorials/d​epth-of-field.htm (external link)


EOS 5D Mark II | EOS 40D | EF 17-40 f/4L | EF 24-70 f/2.8L | EF 85 f/1.2L II | EF 70-200 f/2.8L IS | EF 50 f/1.8 II

  
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mskat
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Jan 17, 2012 09:17 as a reply to  @ patman530's post |  #4

Thank you. I read several articles on Hyperfocal Distance, but am left still confused. If as you say: f11 at 25mm gives a hyperfocal distance of 9.6 ft and therefore a DOF of 4.8ft to infinity. Therefore, focussing at/beyond 9.6ft will achieve what you are looking for. How do I calculate it to give me the end result? Are you saying that I should focus somewhere at 9 ft.? Lets say I had a lens at 400mm how would I calculate that?


Gear: Canon 7D, Canon Rebel. Lens: (Canon): 50mm 1.4, 70-300, Macro EF 100mm f/2.8., 18-135, 100mm-400mm

  
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DunnoWhen
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Jan 17, 2012 11:22 |  #5

mskat wrote in post #13718881 (external link)
Are you saying that I should focus somewhere at 9 ft.? Lets say I had a lens at 400mm how would I calculate that?

Yes and No.:-)

As I said, HD is a function of both focal length and aperture.

In my example, 25mm at f11 means that the HD is 9.6ft and, so long as you focus at a distance of 9.6ft or more, you will achieve the DOF you want (4.8ft to infinity).

Check out THIS (external link) DOF calculator.

At 400mm your HD’s would be

  • at f22 - 1222.3 ft
  • at f16 - 1728.1 ft
  • at f11 - 2443.3 ft


At the other end of the scale
At 10mm your HD would be

  • at f22 - 0.8 ft
  • at f16 - 1.1 ft
  • at f11 - 1.56ft

My wisdom is learned from the experience of others.
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help depth of field
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