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 Post subject: Purple flower
PostPosted: Wed May 28, 2008 1:08 pm 
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Here is another purple flower from work. Comments are welcome.

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 Post subject:
PostPosted: Wed May 28, 2008 5:25 pm 
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you focused on the petals but the pollen grains became blurred! Watch out for that!


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PostPosted: Wed May 28, 2008 6:35 pm 
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kno3 wrote:
you focused on the petals but the pollen grains became blurred! Watch out for that!


I keep having that problem when I'm doing any kind of macro photography. What is the best way of getting round this?

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 Post subject:
PostPosted: Wed May 28, 2008 10:09 pm 
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Welly wrote:
kno3 wrote:
you focused on the petals but the pollen grains became blurred! Watch out for that!


I keep having that problem when I'm doing any kind of macro photography. What is the best way of getting round this?


Using a small aperture, like f/16, f/22 or more. Throw your camera in aperture priority mode or manual mode, and experiment taking pictures of the same object until you get a good idea of what kind of DoF you need to get everything you want in focus. Focus on the nearest element that you need in focus, and go through your apertures and pixel peep them in your LCD screen afterwards to see what's good.

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 Post subject:
PostPosted: Wed May 28, 2008 10:22 pm 
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exactly as sync said...the higher the aperture number the less blur effect you'll get therefore you get more focus.


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 Post subject:
PostPosted: Wed May 28, 2008 10:27 pm 
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kno3 wrote:
exactly as sync said...the higher the aperture number the less blur effect you'll get therefore you get more focus.


OR manual focus. because the bigger the f-number the longer exposure and also the less DOF.

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 Post subject:
PostPosted: Wed May 28, 2008 11:12 pm 
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JakeOConnell wrote:
kno3 wrote:
exactly as sync said...the higher the aperture number the less blur effect you'll get therefore you get more focus.


OR manual focus. because the bigger the f-number the longer exposure and also the less DOF.

I think that's a typo there, Jake. The bigger the f-number the greater the depth of field.

On a wider point, provided the f-number is large enough to achieve the required depth of field then it can be counter-productive to go larger. Image softening due to diffraction will certainly be kicking in at f/11 or larger on cropped sensor DSLRs (some would argue that the figure should actually be f/8) and for compact/bridge cameras the required f-number will often be f/4. Have a look at the article Understanding Diffraction for why this is so. The article Understanding Depth of Field should also be useful and it includes a handy DoF calculator which handily illustrates how DoF is dependant on sensor size, actual (not full-frame equivalent) focal length and distance to the subject as well as f-number.

Bob.

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 Post subject:
PostPosted: Thu May 29, 2008 5:24 am 
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kno3 wrote:
you focused on the petals but the pollen grains became blurred! Watch out for that!


Thanks kno3, I didn't have the option to set my aperture since I was using my Canon SD 870IS point and shoot. I didn't have this problem when I'm using my 40D. I should've mentioned this in the first place before posting. Sorry all...

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 Post subject:
PostPosted: Thu May 29, 2008 5:41 am 
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Bob Andersson wrote:
Understanding Depth of Field should also be useful and it includes a handy
Bob.

Thanks bob for the link. It is very usefull and beneficial to all in understanding the DOF.

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 Post subject:
PostPosted: Thu May 29, 2008 10:26 am 
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You're welcome :)


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 Post subject:
PostPosted: Fri May 30, 2008 12:10 am 
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I have had this problem also. I find the wind to be a problem. I almost need another had to keep the flower stable. I need to work with the F numbers. thanks to mention the numbers. I haven't experimented up that high yet. nice to get an idea what I might need.


Also, expecially on a tripod. I found that using Live View and magnify it 5x to get the best dead on focus if you have the time.

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