imagemeister Loc: mid east Florida

These lens supports also help protect the extending zoom portion of large zoom lenses from accidental jolts/knocks that might cause internal damages ....so there is a safety aspect also .....

Ranjan Loc: Currently Cyber-Nation!

Some of the folks might find these interesting. The last one deals with the tripod mount which also raises weight-bearing concerns from time to time:

http://www.reddit.com/r/photography/comments/2fmrd7/how_strong_are_lens_mounts/?st=j2gcn419&sh=08ba2aab
http://www.pentaxforums.com/forums/6-pentax-dslr-discussion/253570-when-lens-too-heavy-camera-mount.html
http://www.quora.com/How-heavy-a-lens-can-you-attach-to-your-camera-body-before-the-lens-mount-breaks
http://www.dpreview.com/forums/post/57019671
http://photo.stackexchange.com/questions/23634/how-strong-is-the-tripod-mount-on-the-bottom-of-a-dslr

RRS Loc: Not sure

The simple answer is no. You sure wouldn't want to mount the camera to the tripod and then mount a lens with a collar because that would put a lot of stress on the point where the camera is mounted to the tripod. As has been said, with a long lens, first mount the lens and then mount the camera to the lens.

RRS Loc: Not sure

And I was thinking how heavy the Canon 1DXII is.

RRS Loc: Not sure

Go and look up RRS and they sell just what you are looking for. It can be adjusted for almost any lens.

ecurb1105

Metal lens mounts to metal framed bodies are not usually a problem. If you want a rig that supports the body as well as the​ lens, check with Kirk Enterprises or a professional. Cinema supply house

chasgroh Loc: Buena Park, CA

I shoot alot with a 200-400 f4 Nikon lens hooked to a D5 (or previous models)...heavy stuff. Monopod hooked to the lens mount, camera floating off the end of the lens. Long days sometimes, never a problem of over-stressing the equipment. I even have Tenba bag that accepts both lens and camera body so I'm packed and ready to fly *fast*...seems to me the equipment is engineered for heavy usage...

speters Loc: Grangeville/Idaho

All DSLR's are light weight, especially when compared to big lenses, there is a lot less stress on the lens mount from a little camera than a lens. One has to figure in length as well (a camera body is very short, but long lenses do exhibit quite a force of leverage as well, due to their length!

jimq Loc: Cape Cod, MA

Google Benro LH1400, I think that's what your looking for.

agillot

i solved that problem by making a brace using a metal bar from the hardware store , galvanized and has holes in there , used as a strap to hold things .goes from the body tread to the lens mount .so now the body and lens are one .

lautenk2

Take a look at the size of the metal lens mount, then take a look at the little 1/4"-20 threaded hole known as the tripod mount on your camera. The lens mount is much stronger. My point is, your camera IS LIGHT WEIGHT compared to the structure of the lens mount. People have been hanging heavier cameras than yours off the end of tripod mounted lenses for a long time. I'm assuming you're not mounting this tripod to an adventure-touring off-road motorcycle, or a rocket.

It could get worse. If you firmly attached a lens to your tripod mount, and then firmly attached the camera to the same tripod mount somehow, and assuming all this stuff is fairly rigid (which it better be, or it's not worth owning) any tiny misalignment in your rig would cause very large stresses in the lens mount (actually, large stresses throughout the entire assembly between the two mounting points) as you tighten up the last part of your assembly. I suppose you could design something adjustable, but that sounds like a lot of time & money spent fabricating and machining a complicated rig for no good reason.

I think you are worried about a non-issue, but I really like that you put independent thought into this structural loading issue. I love this stuff, that's why I commented. BTW, I'm an engineer, and I know how to do the pertinent calculations, but that's a lot of work, and I'm not gonna do it because I think the answer is obvious based on the above arguments.

lautenk2

There is such a thing as purple Locktite, lower strength than blue but strong enough for small expensive things that might need to be disassembled someday, like optics and electronics. You won't see it on the shelf at Pep Boys, but amazon ...

imagemeister Loc: mid east Florida

Yes, I have done this also - only with aluminum - ALSO, makes a NICE carrying handle !

ecurb1105

Think of the old 300mm f2 Nikkor on a tripod using the lens tripod mount, add a Nikon F2 body with motor drive and 250 exposure back. Thousands of frames and the rig was solid as a rock. And now Nikon has widened the front body flange to make the mount even stronger.

cambriaman Loc: Central CA Coast

A well designed camera will take into account that heavy lenses will be used and the mount is built accordingly. Lenses that the manufacturer deems as heavy for known body designs are provided with a tripod mounting ring and implies that the tripod should be on the lens with the camera body unsupported. I have mounted BOTH body and lens on separate tripods for really long focal lengths. I know that works. Obviously you won't be using that set-up for BIF or walk around candids!