[_Microft]

From the article: "To minimize jitter of the system, and to enable 22 shots per minute, the mirror must be moved into the permanent up position."

This makes it sound like they are using an electronic shutter instead which circumvents the lifetime issues.

[m463]

For a DSLR the mirror is independent of the shutter.

Mirror lockup mode is usually used to lower vibration or speed up picture taking, but the shutter still has to actuate.

EDIT: details of 1000D and shutter:

https://en.wikipedia.org/wiki/Canon_EOS_1000D

https://en.wikipedia.org/wiki/Focal-plane_shutter

[throwaway22032]

The mirror being up likely refers to the viewfinder mirror. I haven't used a DSLR, only mirrorless, but I wonder if that could be independent of the shutter.

[_Microft]

That's exactly the mirror that gives (D)SLR's the R ("reflex") in their name. It's in the path between sensor and lens and redirects the image towards the view finder. When taking a picture this mirror moves out of the way and the image is projected on the film/sensor instead. The advantage of that system is/was that the photographer can preview the image as it will get captured.

[throwaway22032]

Ah, so there's no shutter at all then? As in, the mirror itself forms the shutter?

For some reason I figured there were both. Makes sense I guess.

[RobotToaster]

No, in most* cameras there's still a shutter behind the mirror, the mirror can't move that fast so would limit the top shutter speed too much.

*The Ihagee Exa is the only one I know of that used a mirror guillotine shutter.

[actionfromafar]

I think (some? most?) motion picture cameras used a rotating mirror for shutter.

[smogcutter]

Correct, it’s like a mirrored fan blade and rotates continuously.

Ironically, with mirror reflex system what you see through the finder are precisely the moments not captured on film. Very quick events, muzzle flashes for example, can be missed entirely.

Notably, some Bolex cameras (and others?) used a beam splitter system where you do see what the film sees, with no flicker from the shutter. The tradeoff is a dimmer image in the finder, and you’d need to overexpose to compensate for the lost light.

[numpad0]

That will expose the bottom side of the film longer than the top, unless there's a second mirror that folds up :)

ref: https://youtu.be/SynB6Qypk4c?si=wmLgwjTQNeDtqCYl&t=64

[ginko]

There is a separate shutter.