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Old Oct 26, 2009, 4:20 PM   #1
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Default General Aperture/Focus question

First, here's the picture - randomly selected as I browse what is the smugmug.com beast :
http://uwimages.smugmug.com/keyword/...38276186_We7xs

The information says that it was taken using an aperture of f18.

Even though I see the final results, I can't seem to shake the fact that, IMO, there should be a greater area in focus? Or was the camera that close to the subject that this is what one should expect?
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Old Oct 26, 2009, 4:33 PM   #2
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The 105 used for that is possibly the 105mm Micro Nikkor at close to, if not the cloest focus distance, or they may have used an extension tube with a 105mm non-micro lens like the manual focus Nikkor 105mm f2.5, so depth of field would be very narrow, much like someone here using the EX25 tube with a 70-300 or 50-200 Zuiko.
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Old Oct 26, 2009, 6:00 PM   #3
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Quote:
Originally Posted by TekiusFanatikus View Post
First, here's the picture - randomly selected as I browse what is the smugmug.com beast :
http://uwimages.smugmug.com/keyword/...38276186_We7xs

The information says that it was taken using an aperture of f18.

Even though I see the final results, I can't seem to shake the fact that, IMO, there should be a greater area in focus? Or was the camera that close to the subject that this is what one should expect?
It's what I would expect.

Let's say we are at 1ft, if that is the case then here are the details for what will be in focus.

Depth of field Near limit 11.9 inFar limit 12.1 inTotal 0.16 in

That's not a lot in focus at all, but this is the thing about Marco photography you have to use very narrow apertures to get lots in focus.

They are some nice photos so glad you pointed me to their page.
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Old Oct 27, 2009, 8:56 AM   #4
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Here is a link to a handy on-line DOF calculator that is designed for specific cameras, including Olympus dslrs. It's a good way to determine how much/how little DOF you'll have in specific situations.

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