macro best way to improve dof

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hi all just purchased some extension tubes to go on my nikon d90 with a 18-55mm lens but was just wondering whats the best way to improve dof cheers
 
You have 2 real alternatives that spring to mind. Firstly, set your aperture to f11 or even f16. The drawback with using smaller apertures is loss of sharpness due to diffraction. Its a trade-off really. The other option is focus stacking. Here you take several shots moving the focus slightly for each shot. You then process them in software. This can work well and give greater DoF than an other process that I can think of. If you already have Photoshop then stacking is available from the later versions. There's a freebie called CombineZM or a commercial program called Zerene Stacker which I have used and works well.
HTH
 
You can also improve the APPARENT DOF by shooting in a single plane e.g from above as in this shot:

11042.jpg

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