Thom on Nikon's unanswered questions...

Started 10 months ago | Discussions thread
Tony Beach
Senior MemberPosts: 5,058
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Re: valid points
In reply to Devendra, 10 months ago

Devendra wrote:

Tony Beach wrote:

Devendra wrote:

Valid point about shutter vs mirror, but I don't think mirror flipping could be a battery issue. Both D7100 and D800 use the same battery.

The mirrors are not the same size though, the D800 mirror is over twice as large. Again, to get the D800 mirror to go from 5 fps to 6 fps requires going from 7 volts to 10.8 volts (those are the rated voltage of the EN-EL15 versus the EN-EL18 or 8 AA batteries).

large doesn't translate to weight.

At half the size there's not a chance that the DX mirror is larger. Also, greater size means more leverage is required to move the FX mirror, so even if they were the same weight it would require more power to move the FX mirror.

it could be same mirror in D4 and D800?

these mirrors could be lighter in D800,

or could be same as D4. plus 8AA gives 10fps in D4.

D4 body is larger, so there's more room there for a larger motor to move the mirror and more inertia for mirror dampening (so a larger mirror hitting a smaller body with higher pixel density could be the issue as well). Also, the D800 shutter life expectancy is half as much as the D4's shutter life expectancy, which indicates that the D4 is more durable.

point of my post wasn't the limitation, but the possibility. since we both don't know the exact internal components - neither is wrong or right.

It's likely that the camera's components are engineered to accomplish target specifications and going beyond those specifications essentially redlines the capabilities of those components. It could well be that some cameras used by some users would tolerate going beyond the specifications, but it's also likely that many cameras would end up needing to be repaired as a result of going beyond what they were engineered to do.

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