I have 2x 410s and a 405, I bought the 405 to put the 8x10 on but as it has a higher profile, the camera does not seem as stable on it as it does on the 410s.
I think that Manfrotto have been very conservative with the maximum weight that the 410 can take, I have had my 8x10 Peco Profia Monorail on them with full 39" rail and a 300mm f5.6 Symmar S with no problems whatsoever.
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