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christopher_wilson9
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Exposure Date: 2012:06:15 06:13:27;
Make: Canon;
Model: Canon EOS REBEL T1i;
ExposureTime: 1/160 s;
FNumber: f/3;
ISOSpeedRatings: 100;
ExposureBiasValue: 0;
Flash: Flash did not fire;
FocalLength: 100 mm;
Software: Digital Photo Professional;

From the category:

Macro

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cycler48

At the f stop you're using the DOF is only 0.08" at 18 inches. By using an f stop of 6.4 you can double that depth. You'd also need a higher ISO setting to keep your exposure time low. I've just begun using a macro lens myself, and there is a bit of a learning curve. 

If you have an iPod touch or an iPad, you can download an app called SimpleDof that will show you what the DOF is for the settings and lens you're using. It's really a handy app to have.

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