Macro Focus Stacking

Started Apr 8, 2013 | Discussions thread
digital ed
digital ed Veteran Member • Posts: 3,539
Re: Why do you trust focus fine-tuning so much?

BJN wrote:

I haven't tried using lens micro adjustments for focus bracketing, but I wonder if you've done controlled tests to see if the focus increments are indeed evenly-spaced and reliably so? I'd be very surprised if they were either that precise or that consistent.

There's a reason most focus stacking is done by moving the camera or the subject in precise increments. Focus bracketing via an auto focus lens may require more depth of field to provide the necessary detail overlap.

First, with focus stacking you do not use auto focus. The software adjusts the focus in steps it has calculated. Helicon, using DOF information, does the step calculation for you and steps in the increments necessary to have appropriate focus information in each stack step.

None of the stackers are perfect. Quite often it is necessary to either change how the stack is calculated or adjust/eliminate individual images in the stack to correct for the blurriness in the resultant image. This is not a trivial exercise and it seems the complaints in this thread about blurriness in the final image is because the posters do not know this is often necessary or do not know how to do it.

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