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digital cameras carried on planes in the early days had cosmic ray issues too. So they sent them by boat. Hell. The ones today do. This is a weird article thoug
by photoGrant 3y ago
digital cameras carried on planes in the early days had cosmic ray issues too. So they sent them by boat. Hell. The ones today do. This is a weird article though. A lot of cameras compensate for dead pixels and cosmic rays.
It should also have been designed in every camera to have unique file names. It’s ridiculous they all don’t.
- sudosysgen 3y agoIf you use a Sony A7 series camera, every month, the camera will take a picture upon shutting it off, which it uses to remove dead pixels/hot pixels - you can hear it, actually. If ever you have a pixel die or get stuck, you can also manually set the date a couple months ahead and turn it off - it will most likely be fixed when it turns back on.
- mschuster91 3y ago> If you use a Sony A7 series camera, every month, the camera will take a picture upon shutting it off So THAT is that mysterious click-clack of the shutter that randomly appears on my A7S2. I've been putting off sending it in for repair, but now I can completely avoid that. Many thanks! Do you happen to have a link to some documentation for it?
- sudosysgen 3y agoAs far as I know, there's no official documentation for it, but people noticed that it happened every month and that it would fix dead pixels (for example: https://www.4kshooters.net/2015/12/01/an-easy-trick-to-fix-dreadful-dead-pixels-in-your-sony-a7s-ii/ https://www.4kshooters.net/2015/12/01/an-easy-trick-to-fix-d...) I personally used this trick twice to fix dead pixels on my camera, so I can attest to that. For cameras without a mechanical shutter, there is instead an option to do it in the menu, for example : (https://helpguide.sony.net/ilc/2010/v1/en/contents/TP0003229312.html https://helpguide.sony.net/ilc/2010/v1/en/contents/TP0003229...)
- kuschku 3y agoFunny, on the FX30 it's actually exposed as a setting with a proper description. Maybe because the FX30 lacks the physical shutter, and instead relies on you putting a lens cao on? If so, I'd expect the A9iii to have the message too.
- frostburg 3y agoI would assume so, it's the same on my Sigma fp L.
- strogonoff 3y agoDoes fp L automatically offset raw values in DNG/CinemaDNG files in accordance with the latest dark frame, or is it only applied to JPEG output?
- frostburg 3y agoSorry, I only saw this question now. It does get applied to raws but I think in a non-destructive way (this is also true of Nikon cameras, if you look at the untouched, non demosaicized image you can spot the hot pixels).
- strogonoff 3y agoThanks for the info. I think if you can see hot pixels when looking at the raw before demosaicing then the dark frame is not applied (which makes sense, since a DNG is supposed to be more or less a sensor snapshot). If you do not see them after you processed the raw, I think that would just be your software filtering outliers as best it can, since it would have no way of knowing about the dark frame. I doubt it embeds the dark frame in every DNG, would take up extra space and I am not sure the format even supports that, so likely it just keeps the latest dark frame in memory and applies as part of internal pipeline.
- photoGrant 3y agoA manual sensor clean in most cameras does this. If mirrorless, leave the cap on
- sudosysgen 3y agoIt's not about dust on the sensor, it's actually software that maps dead pixels to fill them in every time you take a picture (as well as dark frame offsetting, presumably)
- photoGrant 3y agoAgain… the manual sensor clean action action does both. Granted I mean the manual ‘automatic’
- sudosysgen 3y agoAh okay, I was confused on what you meant by manual sensor cleaning, to me that means (on a DSLR also locking the mirror up) and swabbing out the dust. On a Sony E-mount camera, the ultrasonic sensor cleaning doesn't do pixel remapping, only the date trick (or the menu option on electronic shutter models) works to trigger it manually.
- KennyBlanken 3y agoMany cameras have a menu option to trigger a dark frame calibration. Been a thing for a long, long time.
- lakpan 3y agoSo, wait. The camera can fix dead pixels but only does so once a month? Dead pixels are dead easy to detect by the sensor, why don’t they do it immediately? Way to ruin a bunch of photos between cleanups…
- yakubin 3y agoEvery photo taken shortens the life of a sensor.
- riversflow 3y agoTo add to this, with those particular cameras(it’s the frame I shoot on), you’re encouraged by the form factor and ergonomics to turn them off when idle to get the most out of the smallish battery, they boot in like 1s. A battery is good for ~350 shutter pulls, I don’t want to use one of those every time I think about taking a picture. Also, a dead pixel is not a ruined photo, it’s a minor inconvenience in editing at worst. And every photo I take on a FF is getting edited, the gorgeous RAW output is what I’m there for.
- lakpan 3y ago> minor inconvenience Do you have software that automatically fixes this issue in all the pictures at once? Because as a non-professional I can only think of a very manual approach. On my old phone, dust made its way into one of the cameras and now all of those photos are forever ruined (or until I find a way to somewhat automate this fixing)
- sudosysgen 3y agoAny real photo editor will allow you to batch a patch heal operations. Lightroom, Photoshop, GIMP, Darktable, etc... all support this.
- sudosysgen 3y agoThat's not really true, it's only a problem for the shutter. The sensor doesn't really break.
- yakubin 3y agoDoes it affect RAW photos or only JPEGs?
- sudosysgen 3y agoIt affects RAW photos, too. You also have similar artifacts sometime from on-sensor phase detection pixels.
- CarVac 3y agoIt's just them performing dark frame subtraction at short shutter speeds too, not just long ones.