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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
by _Microft 2y ago
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.
- throwaway22032 2y agoThe 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 2y agoThat'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 2y agoAh, 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.
- ginko 2y agoThere is a separate shutter.
- RobotToaster 2y agoNo, 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 2y agoI think (some? most?) motion picture cameras used a rotating mirror for shutter.
- smogcutter 2y agoCorrect, 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.
- actionfromafar 2y agoCuriously, there was also a Canon SLR with a beam splitter. https://en.wikipedia.org/wiki/Canon_Pellix https://en.wikipedia.org/wiki/Canon_Pellix
- numpad0 2y agoTechnically, many dSLRs use beam splitter principle and secondary mirrors to feed the image to AE/AF device at the bottom side of mirror box.
- RobotToaster 2y agoSony also made some SLR that used beamsplitters https://en.wikipedia.org/wiki/Sony_SLT_camera https://en.wikipedia.org/wiki/Sony_SLT_camera
- numpad0 2y agoThat 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 https://youtu.be/SynB6Qypk4c?si=wmLgwjTQNeDtqCYl&t=64
- m463 2y agoFor 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/Canon_EOS_1000D https://en.wikipedia.org/wiki/Focal-plane_shutter https://en.wikipedia.org/wiki/Focal-plane_shutter