Peacock herl is highly valued by fly-tiers for the natural iridescence.
This is a 10-shot stack. Canon 100mm Macro w/ Minolta 50mm reverse mounted, OCF, 1/250, f8, ISO 100, +2/3 FEC; shot tethered via lap-top - focus movement controlled via Live Remote Shooting - 1 'Medium Step' between each image. I have found that the lap-top needs to be on a separate table from the subject so as to eliminate vibration/movement.
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to get initial focus, then used tethered focus for the 10 shots necessary for the stack.

