The other day I said I could use one axis of my macro cross-slide to
resolve the tripod socket off-center problem on my E-M5. The other axis
can take care of adjusting the no-parallax-point.
All well and good until I put the rig onto my tripod on top of the
Manfrotto 410 geared head. I had intended to use the level on the
geared head to level the tripod itself and then use the head to control
the stepped rotation for panos. No go. I had failed to notice that the
camera mounting plate on the geared head is nowhere near centered with
respect to the vertical axis of the tripod.
Back to ground zero. I pulled out the original Manfrotto 3030 3-axis
(non-geared) head that I bought with the tripod about 20 years ago. It
*appears* that the mounting plate there may actually be in line with the
vertical axis of the tripod. The problem is that I don't know how to
verify that it really is aligned. This is what it looks like.
<http://www.ebay.com/itm/BOGEN-MANFROTTO-3030-141RC-3-WAY-PAN-TILT-HEAD-VERY-GOOD-COND-/271529767080?pt=LH_DefaultDomain_0&hash=item3f386f70a8>
Anyone have an idea how to tell if the center of the QR plate on top is
really directly above the center of the tripod post? I guess I could
suspend a plumb bob above the screw on the QR plate and see if the plumb
bob stays centered on the screw as the whole assembly is rotated.
Chuck Norcutt
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