Jae
The TILT/SWING axis for the TECHNO goes right through the center of the lens .
This is IMO a big advantage for focusing .
With the ALPA , the TILT/SWING axis is either at the bottom or the side of the lens mount to the camera . That makes focusing more difficult .
How do these technical differences influence your Scheimpflug calculations , if at all ?
Jürgen:
I can tell only for three Tech Cameras; ALPA, A-S RM series and Cambo. All three camera systems have the axis of lens tilt/swing through the center of the lens. I think you are mistaken (I am 99% sure) about the ALPA. As you can see from the attached photo, the axis is in the middle.
It is true that it is easier to focus with the axis in the middle of lens when you are doing by visually, either with GG or LV. My old A-S F-Metric Compact had the option called Orbix which put the tilt axis in the middle.
With the camera where the tilt axis is not located along the lens axis, you have to make an adjustment for the distance between the lens nodal point and DB sensor plane by a small a mount (= tan (alpha) x L, where alpha is lens tilt angle and L is the distance between tilt hinge and the lens center) in calculating the focus distance).
Hope it answers your question.
Jae M
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