I have posted this message to the Digital Cameras & Shooting Techniques forum but I mention it here because my problem involves MFDBs. I have posted the images referred to in the post, to the other forum.
Please post any assistance to the other forum.
Roger
My problem:
The full subject of this message is: Squaring up camera so camera is perpendicular to central axis of subject and rear left and right edges of subject are sharp.
I want to photo a bird's skull so the rear right and left edges are sharp and then take shots at closer distances coming forward for focus stacking.
I am using a Linhof Techno with a sliding back and a P1 4-150 sensor unit. I have the skull extending over the left and right frames of the sliding back.
I thought I could centre the skull over the frames from the sliding back (so the edges of the skull are the same distance from the edges of their respective frames), note the difference between the distances from the sensor when focusing on each of the right and left edges of the skull, move the lens to the midpoint of these distances and rotate the camera (not sure which way) and, hopefully, the two edges will eventually be in focus.
I have spent hours trying to find which way I should rotate the camera without success and, no matter what I try, getting the two rear edges in focus has eluded me. I know that the right edge of the skull is captured on the left edge of the sensor and vice versa but this has not helped me!
I think swinging the sensor should not be necessary and that all I should have to do is centre the sensor over the midpoint between the rear right and left edges (that is, make each edge the same distance from the external edge of their respective frames) and make the plane of the sensor parallel to a line drawn between the two rear edges.
I also think the fact that the side of the skull is curved should be irrelevant to getting the two edges sharp.
I attach some pictures of my set up.
Any assistance would be gratefully received!
Roger
