Alternate Stacking Concepts for Extreme Macro Use

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mawyatt2002
mawyatt2002 Regular Member • Posts: 418
Alternate Stacking Concepts for Extreme Macro Use
3

Many folks use focus stacking rails, both manual and automated at 1X and higher magnifications. As magnification increases focus stacking becomes more difficult and equipment more expensive where DoF can be as little as 3 microns, so alternatives have been investigated. Movement induced vibration, camera shutter induced vibration, static friction, backlash, movement non-linearity and so on all play to make extreme macro very difficult.

The surplus market has been kind and supplied some quality items in the past (THK KR rails for example) and recently provided a piezoelectric stage from Physik with potential for extreme macro use. The general idea is to move either the camera/lens or the subject for focus stacking. By placing the subject on the piezoelectric stage, the subject can be moved in tiny increments for focus stacking. You can follow the details over at PM here:

http://www.photomacrography.net/forum/viewtopic.php?t=39962&postdays=0&postorder=asc&start=0

As noted at PM the piezo stage requires a controller which has been developed (actually 2 were developed) for extreme macro use. Here's a few images of the piezo controllers.

Standard Piezo Controller

Standard Piezo Controller

Instrument Grade Lab Piezo Controller

Instrument Grade Lab Piezo Controller

Instrument Grade Lab Piezo Controller

Another concept for extreme macro use is utilizing a standard "speaker" as a Voice Coil Motor. The general idea is to place the subject on the speaker cone which moves with applied current and allows focus stacking by moving the subject on the speaker cone, details at PM here, it's long, so note later parts:

http://www.photomacrography.net/forum/viewtopic.php?t=33439&postdays=0&postorder=asc&highlight=vcm&start=255

And here:

http://www.photomacrography.net/forum/viewtopic.php?t=40123

Here's a few images of the VCM Controllers

Standard VCM Controller

Standard VCM Controller

Instrument Grade Lab VCM Controller

Instrument Grade Lab VCM Controller

Research is like a treasure hunt, you don't know where to look or what you'll find!
~Mike

Pentax K-r
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