Andrew,
A cheaper thing to try first up is an ARC(hitectural) hex plate, I used
one quite a bit before I got the 410 head which naturally has a
different QR plate !
...Wayne
>
> This might be well known to many, but thought I'd share it anyway.
>
>
> I've been frustrated trying to take vertical format shots
> with the 300/4.5 tripod mounted. I rotate the tripod head
> from horizontal to vertical format, which is easily done,
> but the centre of gravity shifts and things get off balance.
> More annoying still is that the camera slips on the screw.
> The camera/lens can of course be rotated in the lens tripod ring, but
> that is a PITA to do quickly and accurately.
>
> I also use a focussing rail + macro lens a fair bit -- same problem.
>
> The tripod is a Manfrotto 190 PRO B with an 029 head (3-way,
> spirit levels). Hex plate. Very nice to use, mostly.
>
> The tripod head rotates to the left, so in vertical format
> the weight of the lens encourages an anti-clockwise rotation
> of the camera/lens unit on the tripod screw, tending to
> loosen the tripod fitting. The head won't rotate to the
> right, which would give the camera a clockwise rotational
> tendency, thus tightening rather than loosening on the tripod screw.
> Annoying.
>
> Overtightening the tripod screw is not a good solution, so I
> just kept an eye out over time for something that might help.
>
> Looking through the Manfrotto catalogue a couple of weeks
> ago, I spied an elbow bracket (cat no 340) comprising a hex
> mounting plate as usual, with another hex plate attached at
> right angles to allow quick and easy
> switching to vertical format. This can be used so that the
> unit mounted
> on it moves clockwise under gravity, so the camera doesn't
> slip on the screw. There is also an anti-slip device that
> can be positioned to restrain
> a camera from rotating.
>
> The re-positioning also keeps the centre of gravity over the tripod
> head, and doesn't move the lens very much from its
> horizontal format position.
>
> At $A90, this thing isn't cheap, but I'm finding it to be
> very useful indeed -- one of the better little toys I've
> thrown money at.
>
>
> regards
> Andrew
>
>
>
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