I am looking for some way to support long, heavy Canon lenses (200mm and 400 mm) on the FS700.

I don't want all that weight hanging on the front of the lens adapter.

Anyone know of a system to do this?

I just bought this shape lens support to use with my 15mm rods with the movcam rig.

SHAPE Lens Support LENSSUP1 B&H Photo Video

Thanks for the suggestion, but I am really looking for something more substantial.

I am looking for a support system where I can attach the foot of tripod mount ring that comes with each lens.

This one indicates it is specifically for dSLR lenses with tripod mounts.

Chrosziel AC-401-33 HDSLR Universal Lens Support C-401-33 B&H

I think what you were invisaging was this?

Support bridge for SLR lenses (http://www.mtfservices.com/home.html?page=shop.product_details&flypage=flypage.tpl&product_id=88&category_id=2)

But it looks a little less macho than the one at B&H.

The tripod support under big lenses like the Canon 80-200/2.8 are there to attach to a tripod, where the lighter camera body attaches to the lens. You could do the same, but the FS700 has enough mass to lead me to suspect that approach is a 'swings and roundabouts' situation.

This is a more studly version of the previous item:

Other Accessories : Lens Support Bracket (http://www.genustech.tv/other-accessories/lens-support-bracket)

As you can see, it's designed to hold the lens further away from the joint, thus - through the magic of leverage - it can support more with less, though you do have to pick your contact point carefully.

A bigger issue is if you were putting a Broadcast ENG lens onto an FS100 - yes, it can be done:

B4 2/3" to Sony E mount adaptor package (http://www.mtfservices.com/home.html?page=shop.product_details&flypage=flypage.tpl&product_id=112&category_id=2)

That's probably the studliest mount I've seen, but maybe OTT for a 80-200/2.8.

I tried Alister Chapman's FS100 ENG rig out. His 18x 8mm becomes a 24-432 (and that's 38-691mm in 35mm FF terms); buttery focus, excellent zoom range, but no image stabilisation and the Power Zoom needs to be fed off a V-lock D-Tap.

I just bought this shape lens support to use with my 15mm rods with the movcam rig.

SHAPE Lens Support LENSSUP1 B&H Photo Video (http://www.bhphotovideo.com/c/product/750896-REG/Shape_wlb_LENSSUP1_Lens_Support.html)

Hey Kirk - Curious how "high" that item can adjust to? I bought a similar piece from another manufacturer, but it doesn't actually reach my lenses when I am on my rods (I have a quick release plate on top of my base plate, so the camera is a little higher than it might normally be)

Jag35.com | Products | Lens Support Kit (http://jag35.com/lenssupport.html)
Manfrotto | SYMPLA Lens Support | MVA514W (http://www.samys.com/p/HDSLR-Camera-Support-Accessories/MVA514W/SYMPLA-Lens-Support/110956.html?gclid=CMepoafI-7ECFaReTAodjgIAvA)
Lens Support | DSLR | Long Lenses | 15mm Rod (http://store.redrockmicro.com/Catalog/Accessories/microLensSupport)

I am looking for some way to support long, heavy Canon lenses (200mm and 400 mm) on the FS700.

I don't want all that weight hanging on the front of the lens adapter.

Anyone know of a system to do this?

If you're after a support that will resist lateral movement as well as downward pressure you'll need somthing more along these lines:
Zacuto 1/4 20" Lens Support with 2.5" 15mm Z-1/4-LS2

This will actually connect to the tripod plate mounting block on the canon zooms
p

Do you have a link to this?

If you're asking me, click on the description, it'll link you to b&h

I am just making a prototype for this very purpose, I will post photos here soon. I should have anodized production kits ready by the ends of this week.

I have had a few special requests for this, so I am working on it.

Canon has a few different spacings on their "feet", so it has to be flexible.

I will post progress here soon.

I picked up one of these and it's been fine. I especially liked the 3/8" tapped hole on the base:
Long Telescope Lens Support Mount for HDDSLR 15mm Rod Rail System | eBay (http://www.ebay.com/itm/Long-Telescope-Lens-Support-Mount-for-HDDSLR-15mm-Rod-Rail-System-/250894455962?pt=LH_DefaultDomain_0&hash=item3a6a79949a)

Also, on a related note, can anybody here say if the lens mount assembly of the '700 looks to be any sturdier and less prone to flexing than the one on the FS100?

Here is another pretty good product at the comfortable price of $43

TILTA LENS SUPPORTER LS-T03 [LS-T03] - $43.00 : ProPhotographyGear.COM! (http://www.prophotographygear.com/tilta-lens-supporter-lst03-p-533.html)