Espritmodel.com Telemetry Radio
 
Thread Tools
Old Oct 23, 2006, 04:11 AM
Malcolm Stewart
Guest
n/a Posts
OT ? Home made gimbal type tripod head

My main hobby is photography, and one of my lenses begs for a gimbal style
tripod head, so that when mounted, the lens and camera are more or less
balanced, instead of being very top-heavy and unstable as when using a
normal pan/tilt head. (Ball heads are even less stable, and even big ones
get spoilt when clamped hard enough to hold heavy gear.)

http://www.tripodhead.com/images/WH-200-big.jpg

The image shows the best known commercial device which costs around 500 in
the UK. Rather too much for my limited usage I fear, but what's shown has
to be big and strong enough for all commercial lenses. It's also quite
heavy as a result of the cantilevered design.
My requirements are to mount one lens only, my 6lb. EF 300 f2.8L which some
claim to handhold. (Done that with poor results.)

I've been wondering whether anyone has made their own using, say, 1/2" or
3/4" square section brass tube, or wood even?.
For a single lens, I think the static part of the design could be hexagonal,
with a smaller bottom "half a hexagon" supporting the lens on bearings .
Haven't done any weight calculations yet, but I guess something like the
ASCII art below might work.
_________
/ \
/ \
l l
[] []
l \ / l
\ \_______/ /
\_________/

Any comments orf suggestions? Many thanks.

--
M Stewart
Milton Keynes, UK





--
Posted via a free Usenet account from http://www.teranews.com

Old Oct 23, 2006, 02:11 PM
Peter Parry
Guest
n/a Posts
Re: OT ? Home made gimbal type tripod head

On Mon, 23 Oct 2006 10:00:13 +0100, "Malcolm Stewart"
<malcolm_stewart@megalith.freeserve.co.uk> wrote:

>The image shows the best known commercial device which costs around 500 in
>the UK. Rather too much for my limited usage I fear, but what's shown has
>to be big and strong enough for all commercial lenses. It's also quite
>heavy as a result of the cantilevered design.
>My requirements are to mount one lens only, my 6lb. EF 300 f2.8L which some
>claim to handhold. (Done that with poor results.)


I've got an old Bolex head (picture of a similar one at
<http://www.filmshooting.com/scripts/forum/viewtopic.php?p=92576&sid=d02a75e9d4e1cb084f282fd0 b35698b0>
(towards the bottom of the page).

It is more than strong enough to hold a 6lb lens even when the CofG
is well offset. It's a fairly simple design using two quite large
disks for the vertical and horizontal axis which are clamped by the
small levers you can see on the pictures. The disks are set in a
very thick grease (I used Castrol Heavy when rebuilding mine)which
controls the movement well even with heavy loads. It would be a
relatively simple design to replicate and if you like I can
photograph the innards of mine and send to you.

It's broadly comparable to the Vinten Pro5 I have (Bogen 501 head
/3283 leg) in weight capability - so a conservative 13lb or so. It
isn't quite as easy to move as the Vinten - but it positions very
easily and because of the large surface area locks in place without
having to put huge forces on the levers. There isn't much difference
between the two heads for still photography.





--
Peter Parry.
http://www.wpp.ltd.uk/
Old Oct 23, 2006, 06:11 PM
Malcolm Stewart
Guest
n/a Posts
Re: OT ? Home made gimbal type tripod head

"Peter Parry" <peter@wpp.ltd.uk> wrote in message
news:mqrpj21r1lr7h7oa4rdsk7kjnunsb2h5uj@4ax.com...

> I've got an old Bolex head (picture of a similar one at
> <http://www.filmshooting.com/scripts/forum/viewtopic.php?p=92576&sid=d02a75e9d4e1cb084f282fd0 b35698b0>
> (towards the bottom of the page).
>
> It is more than strong enough to hold a 6lb lens even when the CofG
> is well offset. It's a fairly simple design using two quite large
> disks for the vertical and horizontal axis which are clamped by the
> small levers you can see on the pictures. The disks are set in a
> very thick grease (I used Castrol Heavy when rebuilding mine)which
> controls the movement well even with heavy loads. It would be a
> relatively simple design to replicate and if you like I can
> photograph the innards of mine and send to you.
>
> It's broadly comparable to the Vinten Pro5 I have (Bogen 501 head
> /3283 leg) in weight capability - so a conservative 13lb or so. It
> isn't quite as easy to move as the Vinten - but it positions very
> easily and because of the large surface area locks in place without
> having to put huge forces on the levers. There isn't much difference
> between the two heads for still photography.
> --
> Peter Parry.
> http://www.wpp.ltd.uk/


Many thanks - Didn't know about the Bolex head. I'll check if any are
currently on offer.

--
M Stewart
Milton Keynes, UK



--
Posted via a free Usenet account from http://www.teranews.com

 


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Slightly OT: Home-built tripod-mounted spherical-panorama head Hogster Aerial Photography 30 Jul 16, 2008 04:22 PM
Dragonfly Head Stiffener (Home Made) arrival Micro Helis 2 Jan 18, 2005 12:19 PM
Home-made aluminium head for a Twister CP redryder Micro Helis 9 Jan 02, 2005 07:57 PM
Question home made collective rotor head for gws dragonfly mhale71 Micro Helis 1 Nov 24, 2004 05:43 AM
home made carbon fiber ? mjse Electric Plane Talk 2 May 26, 2001 06:55 AM