Arca-Swiss 6X9 movementsgreenspun.com : LUSENET : Large format photography : One Thread
I apologize in advance for what to many may seem like a couple of dumb questions but here goes anyway:
With the Orbix and using axial tilts on the A-S 69 FC metric I have read that additional movements are necessary when using tilt and rise together. Could someone please explain what and why?
Are additional movements needed when using lenses wider than 75. In other words, with the shorter focal length lenses are the standards thrown out of vertical relative to one another so that the front standard needs to be tilted back (and raised?) when using these lenses?
-- Mark Windom (firstname.lastname@example.org), February 03, 2002
The Orbix move is a segment from a circle of a certain size. As long as the center of the lens lies in the center of this circle, tilt will not change your focus (the distance between the center of the lens and the back remains fixed). This is independent of the focal length.
If you apply front shift prior or after tilt, the lens moves relative to back and the focus plane shifts away. So you better use rear shift in this case.
-- Thilo Schmid (email@example.com), February 04, 2002.
If you use front rise, the center of the lens moves away from the center of tilt rotation, so the focus will shift as tilt changes.
-- Glenn C. Kroeger (firstname.lastname@example.org), February 04, 2002.