70D and 7Dmk2 is coming what to expect?

Started Feb 28, 2013 | Discussions thread
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Re: Structural Load Bearing Parts
In reply to Dale Buhanan, Mar 6, 2013

Dale Buhanan wrote:

WilbaW wrote:

bobn2 wrote:

the ´╗┐fact´╗┐ remains that the 7D has a plastic chassis

For that to be accepted you'd have to prove that there are no metal components amongst the "structural load bearing parts" of the 7D. I can see two large metal load bearing part in the image you posted back on page 2, so how do we make sense of that?

IOW, either the lens mount and the tripod socket are plastic, or they are not "structural load bearing parts". Which is it?

Hi Wilbaw,

I guess Bobn2 is in bed now. In England it is night time.

Anyway, I found another couple of pics that shed some light on this. This is a post by mailman88 who just crashed his 50D with an attached 100-400 on it. The lens mount broke off the camera, and in one pic you can see the camera minus the lens mount and where the screw holes are.


On his other pic you can see the lens with the broken off lens mount from the camera still attached to it, and a piece of the camera came off with the mount! That piece certainly looks like it is made of carbon fiber filled Polycarbonate, or some similar type of resin/plastic material.

There is no evidence of metal load bearing parts to the lens mount. I do not know about the 7D. But for the 50D, I think Bobn2 is correct. If the 7D is siimlar construction, then it is a tough plastic, as it looks to be in the picture.

On mailman88's post you can also see the magnesium alloy shell which ends prior to the lens mount screws. It appears not to be part of the lens mount strength at all. It looks like a shell.

-- hide signature --

kind regards

The statement being made was NOT just that the mirror box was engineering plastic, or that the lens mount was just attached to the mirror box, but, was expanded to say that the magnesium shell has no structural roll in the camera.

The contention was that the engineering plastic mirror box was the chassis of the camera. This is false. The magnesium body does play a structural role, and the back and the front of the mirror box are supported by metal that is attached from the magnesium body. The view presented is similar to that of a 1940s mechanic looking at a modern unibody car, and not understanding that loads can be born by other than a full steel car frame.

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