mattk
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Registered: 27th Feb 06
Location: St. Helens
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me being a noob and all and reading Gazs thread I decided to try it in the garage
if anyone wants to explain anything to me feel free!
Normal, no zoom: F2.8
No Zoom F2.8 Macro
 High zoom no macro
Exactly what I was after 200mm zoom, F3.6 and Macro
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Butler
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Registered: 2nd Jun 05
Location: London
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Wicked example mate, nice one. Should be topped or added to a tutorial or something 
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Hoddo
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Registered: 7th Nov 06
Location: Wallisdown, Bournemouth
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DOF In optics, particularly as it relates to film and photography, the depth of field (DOF) is the distance in front of and beyond the subject that appears to be in focus. Although a lens can precisely focus at only one distance, the decrease in sharpness is gradual on either side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.
For some images, such as landscapes, a large DOF may be appropriate, while for others, such as portraits, a small DOF may be more effective.
The DOF is determined by the subject distance, the lens focal length, and the lens f-number (relative aperture). Except at close-up distances, DOF is approximately determined by the subject magnification and the lens f-number. For a given f-number, increasing the magnification, either by moving closer to the subject or using a lens of greater focal length, decreases the DOF; decreasing magnification increases DOF. For a given subject magnification, increasing the f-number (decreasing the aperture diameter) increases the DOF; decreasing f-number decreases DOF.
When focus is set to the hyperfocal distance, the DOF extends from half the hyperfocal distance to infinity, and is the largest DOF possible for a given f-number.
The advent of digital technology in photography has provided additional means of controlling the extent of image sharpness; some methods allow DOF that would be impossible with traditional techniques, and some allow the DOF to be determined after the image is made.
[Edited on 22-04-2008 by Hoddo]
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JonnyJ
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Registered: 23rd Sep 05
Location: Scotchland
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Nicely c&p'd dan
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Hoddo
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Registered: 7th Nov 06
Location: Wallisdown, Bournemouth
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quote:
Originally posted by JonnyJ
Nicely c&p'd dan
relevant though eh? no point beating about the bush. Its plain as day in that, im not gonna struggle to try and explain
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Scotty_B
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Registered: 11th Jun 03
Location: East Kilbride
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My DOF attempt.
This is one of the first shots I took with my Nikon 105mm VR 2.8 lens.
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paul.mitchell1984
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Registered: 31st Aug 06
Location: Wakefield
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and were you wanting the blue pencil? if so good pic 
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Scotty_B
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Registered: 11th Jun 03
Location: East Kilbride
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quote:
Originally posted by paul.mitchell1984
and were you wanting the blue pencil? if so good pic
Yes, that was the idea.
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Matt L
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Registered: 17th Apr 06
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cool pics kinda of explained it to me a little bit.
quick question though..
f3.6 = focusing items closer
f8 = focusing on items further away?
is that right?
cheers matt
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AndyKent
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Registered: 3rd Sep 05
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Not quite.
You can focus on anything, it just controls how much in front of and beyond the focussed point is clearly visible.
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Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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DOF, with my point and shoot cam
and the opposite way
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