Extension Tube Macro
How does extension tubes effect Depth of field in macro photography?
I am using a canon 60D coupled with a 100mm F2.8 lens, I do knows its a dedicated macro lens but I want to go for higher magnification, I am planning on buying some kenko extension tubes but before I make the purchase ill like to ask
How do you control the depth of field?
How does it effect depth of field ?
There are only 3 factors that affect Depth of Field (DOF):
1) The focal length of the lens.
2) The f-stop used.
3) The subject distance.
You don't need to Google anything - just go here: http://www.dofmaster.com/dofjs.html
Since you are going to be using extension tubes on a 100mm macro lens you're going to be very close to your subject. Factors # 1 & # 3 more or less cancel out factor # 2. It won't matter what f-stop you use your DOF is going to be razor thin. This can easily be seen by using the DOF Calculator. Your 100mm macro will focus to 12.2" but I used 13'' to check the DOF.
100mm macro @ f16 focused on a subject at 13'' DOF is from 12.9'' to 13.1'' so your DOF is from 1/10'' (.1'') in front of your subject to 1/10'' (.1'') behind your subject.
If your set of extension tubes allow you to focus to 8'', at f16 your DOF will be from 7.95'' to 8.05''. If .05'' in front of and behind your subject isn't razor thin DOF then I don't know what is.
Enjoy!
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