How does one achieve critical initial focus with such set-ups? Do you rely on the back’s display and focus peaking display? Does the IQ4 display offer a higher degree of accuracy than those less costly systems such as the GFX (which can be confusing with busy subject matter).
The CAPcam swings and tilts (and shifts/rises/falls) controlled by software.
A typical shot will be of the order of a few hundred microns depth of field (up to maybe 1.5mm at lower magnifications), so it's pretty impractical to even attempt to nail the plane of focus simply by looking at the back. I actually shoot with a Panasonic S1R attached to the CAPcam now, tethered, with the feed from the camera going via USB to the tethering software, and by HDMI to a 55 inch display.
So it's a case of getting close using the S1R's pixel peeping, shooting, looking at the result, and then tweaking the focus points (the CAPcam has several ways of focusing, but the most intuitive to me is by telling it the distance to three points on the image) - this tweaking is typically of the order of 100-200 microns. If you need to stack, this can be done perpendicular to the focal plane, with the camera automatically adjusting tilt and swing angles as the focal distance changes, to maintain the same angle of focal plane to sensor plane.
Kind regards,
Gerald.