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Author DOF, aperture and bokeh
vibrio
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Registered: 28th Feb 01
Location: POAH
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21st Feb 06 at 18:57   View User's Profile U2U Member Reply With Quote
Depth of field is what is in focus, the blur behind and in front is called bokeh. a large aperture (small f number) or zooming willl give you reduced DOF. eg f4 @ 105 give less DOF than F2.8 @ 70mm. these shots were all taken with a 30mm lense and go up in 1 stop per picture. f1.4, f2.0, f2.8, f4, f5.6, f8.
martferguson
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Registered: 15th Jan 05
Location: Southampton
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21st Feb 06 at 19:20   View User's Profile U2U Member Reply With Quote
good work vib, you got the chesty cough too like everyone else in england
Matt H
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Registered: 11th Sep 01
Location: South Yorkshire
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22nd Feb 06 at 10:29   View User's Profile U2U Member Reply With Quote
I'm slowly learning here.....

So to get a shot with depth do not zoom & use a low aperture?
vibrio
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22nd Feb 06 at 10:31   View User's Profile U2U Member Reply With Quote
yes but equally using zoom and a small aperture give you a suject in focus but stands out from the brakground
Matt H
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Location: South Yorkshire
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22nd Feb 06 at 10:33   View User's Profile U2U Member Reply With Quote
So its better to take each pic a few times with differant amounts of zoom & aperture so that you can choose the best pic afterwards?

I'd say the 3rd pic looks best, but if I had taken the 1st pic only I would've thought it lokked good (if that makes sense?)
vibrio
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Registered: 28th Feb 01
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22nd Feb 06 at 12:27   View User's Profile U2U Member Reply With Quote
I favour the second
Matt H
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Registered: 11th Sep 01
Location: South Yorkshire
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22nd Feb 06 at 12:31   View User's Profile U2U Member Reply With Quote
Maybe

The pig isn't in focus as much
Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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23rd Feb 06 at 19:29   View User's Profile U2U Member Reply With Quote
The way the camera exposes at different apertures is strange - even though the same amount of light has fallen on the scene, the camera has made the smaller aperture photos appear brighter.
vibrio
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Registered: 28th Feb 01
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23rd Feb 06 at 19:32   View User's Profile U2U Member Reply With Quote
you get a degree of vignetting at the wider apertures
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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23rd Feb 06 at 20:24   View User's Profile U2U Member Reply With Quote
ahhhh... interesting.

I need to try things with my camera when i'm home

 
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