Re: RBT mounts and calibration of camera verticals

[P3D Jon Golden <3dman@xxxxxxxxxxx>]

Marvin Jones wrote:

>>I have been shooting with my second Realist for a year now and finally realized (after using RBT mounts) that one image appears a little larger than the other.  When I line up the bottom during mounting, one of the images sticks up a little higher into the frame.  Anyone have a possible cause or solution.  Maybe if I tighten or loosen the lense board screws on one side?<

Well Marvin...this is a phenomenon that many RBT mount users discover
after trying the calibrated vertical adjustment system. 

Did you mean one image sits "higher or lower" when put in RBT's with the
same pin bar setting.   "Larger" would be a result of mismatched zoom
lenses perhaps...but a fixed lens in a Realist??.....check that again. I
would suggest that if you only have a .1mm or .2mm adjust ment, which
means you shift the image down on one side by one or two nothces...that
you dont worry about it.....that is pretty common....in all kinds of
stereo cameras.....even RBT's! 

I have spoken with Ron Zak about this....and understanding that a)
Realists, in the manufacturing heydays, rolled off production lines in
the thousands...and b) over the years...a camera can lose its vertical
calibration. So its pretty common to find this offset.

If you have more than .2mm...then send it to Zak, Jess Powell, Piper or
whoever you choose to have do the work.  This problem, by the way...is a
common one that camera stores who attempt to fix stereo cameras, but
dont understand stereo image issues and problems, commonly overlook. 

Well...time to get out the jacks and level the side porch foundation a
few mm, glad I have my Themelisized LED Stereo Chumsuk Leveller
....audios!  Jon Golden RBT USA


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