70D and 7Dmk2 is coming what to expect?

Started Feb 28, 2013 | Discussions thread
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Re: 70D and 7Dmk2 is coming what to expect?
In reply to TTMartin, Mar 2, 2013

TTMartin wrote:

bobn2 wrote:

See the plastic chassis, see also that the lens mount is still attached even though the magnesium skin has been removed - the skin is just that, a skin - not structural.

Sorry it is simply a fact that all Canons apart from the 1D series have plastic chassis.

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More BabelN2 fantasy.

The magnesium shell acts as a structural exoskeleton and everywhere it is screwed, it is screwed into metal and not plastic. It is not simply a cosmetic 'skin' as you suggest.

You might wish for that to be the case, but it is not in fact the case. Any teardown of these cameras that you see, it is quite clear that the skin plays little structural role. It is not even attached at the right places to play a structural role. For instance, the lens mount is not attached in any way to the magnesium skin, therefore that skin cannot play any part in the job of locating the lens in relation to the sensor, which is the most important role of the camera chassis.

Also clearly displayed in your photo is an additional metal reinforcement going from the lens mount to the tripod mount.

Look a bit more carefully, it is not connected to the lens mount at all. Moreover, it is not 'magnesium'. It is good old fashioned steel.

This magnesium exoskeleton

It's a skin, not structural. Sorry about that, but it is absolutely clear from the way it is attached and constructed. If it was an 'exoskeliton' it would need to be attached to the lens mount.

to steel internal extensions exists throughout the camera.

A more conventional term would be 'brackets'. Yes, there are plenty of them and they locate individual components. However, steel brackets are not a magnesium chassis.

Here you can see the steel frame that extends from the 7D exoskeleton and provides structural support to the back of the mirror box.

So while the mirror box is engineering plastic, it is not the 'structural chassis' as you fantasize.

It absolutely is. It is what the lens mount attaches to, and the sensor attaches to the back. That is the important structural component. In the 1D series, Canon makes it out of metal:

Now, why metal in the 1D and plastic in the 7D?

Over 19,600 posts and the misinformation continues to spew forth.

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