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Using Depth Of Field when shooting wildlife

Discuss and share your wildlife photography, filming and equipment
Sprocky
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Re: Photos for Criticism

Unread post by Sprocky » Fri Nov 20, 2009 8:41 am

Josh, in the previous post you mention "depth of focus", do you not mean "depth of field"? They are two totally different things.

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Josh of the Bushveld
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Re: Photos for Criticism

Unread post by Josh of the Bushveld » Fri Nov 20, 2009 8:52 am

Sprocky wrote:Josh, in the previous post you mention "depth of focus", do you not mean "depth of field"? They are two totally different things.

Well, I prefer to use the terms 'depth of focus' and 'field of view'.
'Depth of focus' refers to the spread of objects that appear to be in focus, perpendicular to the sensor plane.

'Field of view' refers to how 'wide' or 'narrow' the image you see is.

Do you agree on these terms? Do you use different terms?

In the context of my post, I thought I was being pretty clear about having more of the birds in focus, and not about how narrow or wide the image is.
The 'mite formerly known as joshilewis

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Glen Reenen TR

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Josh of the Bushveld
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Junior Virtual Ranger
Posts: 1510
Joined: Tue May 19, 2009 2:15 pm
Location: Johannesburg - too far from the closest Sanpark

Re: Photos for Criticism

Unread post by Josh of the Bushveld » Fri Nov 20, 2009 8:58 am

Ok, I've just done some more personal research on the subject.
The term I should have used is 'depth of field'.
I didn't know there was a difference between the two.
This probably deserves a post in the 'how to use your camera' thread.

Basically:
Depth of focus is how much one can move the camera while retaining focus.
Depth of field is the range of objects that appear to be in focus.

Thanks for questioning me on it Sprocky :)
The 'mite formerly known as joshilewis

FGASA Level 1 Guide

Glen Reenen TR

15-18 June: Berg-en-dal

Sprocky
Posts: 1829
Joined: Wed Jun 10, 2009 8:51 am

Re: Photos for Criticism

Unread post by Sprocky » Fri Nov 20, 2009 8:59 am

Still not right Josh. A lot of people confuse them, here is the difference...

Depth of focus vs depth of field

While the phrase depth of focus was historically used, and is sometimes still used, to mean depth of field, in modern times it is more often reserved for the image-side depth. Depth of field is a measurement of depth of acceptable sharpness in the object space, or subject space.

Depth of focus, however, is a measurement of how much the film or sensor plane can be displaced while an object remains in acceptably sharp focus. In this sense, it relates to a single plane in object space.[1][2] It can also be viewed as the flip side of depth of field, occurring on the opposite side of the lens.[2] With the first interpretation, the depth of focus is symmetrical about the image plane; with the latter, the depth of focus is greater on the far side of the image plane, though in most cases the distances are approximately equal.

Where depth of field often can be measured in macroscopic units such as meters and feet, depth of focus is typically measured in microscopic units such as fractions of a millimeter or thousandths of an inch.

The same factors that determine depth of field also determine depth of focus, but these factors can have different effects than they have in depth of field. Both depth of field and depth of focus increase with smaller apertures. For distant subjects (beyond macro range), depth of focus is relatively insensitive to focal length and subject distance, for a fixed f-number. In the macro region, depth of focus increases with longer focal length or closer subject distance, while depth of field decreases.


Hope this helps. :wink:

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Josh of the Bushveld
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Re: Photos for Criticism

Unread post by Josh of the Bushveld » Fri Nov 20, 2009 9:06 am

Sprocky wrote:Still not right Josh. A lot of people confuse them, here is the difference...

Hope this helps. :wink:

It did, thanks. I read, and linked to, the same source :)
Methinks a sticky topic on glossary/terminology is in order? Maybe with some example shots to explain?

I think a sticky post with some links might also be a good idea?

@bert: I know there is some historic content on the forum that covered a lot of these same topics. Can we dig them up and move them?
The 'mite formerly known as joshilewis

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Glen Reenen TR

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