6 ms·
If 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 h
by sudosysgen 3y ago
If 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.