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To stack or not to stack

Started Sep 26, 2019 | Polls thread
John K Veteran Member • Posts: 9,870
Re: Larger DOF with larger sensors (not a typo)

mawyatt2002 wrote:

So you're saying that moving a fraction of a millimeter closer to the subject between frames is actually making a difference in the angle of the light between the flash, subject, and sensor?...

You bet it does!! Shows up as focus banding, when the subtle shades and colors are slightly different between stacks. I've had many stacks ruined by this because with chips you can't blend as easily as you can with insects and flowers. Chips also have thin-film interference effects due to the very thin surface layers like you see in soap bubbles, this isn't restricted to chips either, as bird feathers, some insects and even the oxide levels in certain coins (US Cu pennies for example) have these effects.

Again discussed at length by experts over on PM.

It still sounds like it only shows up under extreme conditions. For focus stacked insects I've never heard of someone having to adjust the angle of the light between frames. Is the there a difference in the effect if the light source is stationary or moving with the camera?

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