Do you know what temperature range this effect manifests itself over? (up to 5f, up to 20f, up to 32f?)
Sadly, no further specifics other than the behavior exhibits itself often at -5F and much less so at slightly warmer temps then not at all when you get up around freezing and above. (It's warmed up here a bunch so further cold weather testing is possible at present). I'm sure everyone, including my buddy, hope this is just an isolated, camera specific, not 1ds3 specific thing.
That is quite the phenomenon. I've shot with the 350D in -20 or so, wrapped in a trash bag to protect it from snow, and it didn't have problems. If I could afford a 1-series camera I'd report on my low temperature experiences.
stanj wrote:
Your 1Ds3 is being _replaced_ because of front focus? Wow.
I know, eh? I was shocked when they told me. I dropped it off at Canon in Toronto b/c it had issues when I took it out to LA last month. My 85mm is spot on with my 5D and my 1DIII (when it locks focus) but on the 1DsIII, it's off by more than the +20 would correct.
I figured there would be an adjustment or two, and they'd fire it back to me. But the solution, as I was told last Thurs, is going to be full replacement. No idea why. But my body was a *very* early model (first 2000 units produced), and I'm guessing the new one will be in the 20-30k range. I'm just happy it's being taken care of. The 1DIII is still awaiting the fix (both sub-mirror and new, mythical one)
I dunno. My guess was that it was just capturing the r-g-b channels but I'm willing to be wrong (maybe it was capturing all of one channel and bits of the others?). Regardless, it's the results that are important at this point, and trying to figure out whether this is an isolated incidence the goal.
nathanlake wrote:
If the macrolenses in the filter were somehow shifted relative to the photodiodes on the sensor, would that cause similar color issues.
It can't be something like that because it only happens on certain frames when bracketing.
nathanlake wrote:
If the macrolenses in the filter were somehow shifted relative to the photodiodes on the sensor, would that cause similar color issues.
It could be that the response of the sensor is not what the processing chain expects and those weird pictures are the result. I would expect the same amplifier and ADC to be used for all the channels, but it would be great to have a pointer to a technical references on how the pixels are processed.
Maybe the sample clock is running out of spec (late or unevenly) and so some of the value of one pixel goes into the value of the next.
I was shooting at Lake Louise in tempertures around -24 C with the 5D without any issues.
Although i was worried that i choose the 5D over the 1DIII (needed the ultra-wide), coz, the back of the LCD, the back of the RRS L bracket and side of the camera had turned to ice from my breath. But when i went back to the hotel after sunrise and morning shoot i was worried about what was going to happen once the camera thawed out, but the camera was fine for my late afternoon shoot.
Didn't have any issues with color shifts in the files.
khurram1 wrote:
I was shooting at Lake Louise in tempertures around -24 C with the 5D without any issues.
Although i was worried that i choose the 5D over the 1DIII (needed the ultra-wide), coz, the back of the LCD, the back of the RRS L bracket and side of the camera had turned to ice from my breath. But when i went back to the hotel after sunrise and morning shoot i was worried about what was going to happen once the camera thawed out, but the camera was fine for my late afternoon shoot.
Didn't have any issues with color shifts in the files....Show more →
Thanks. My 5D was out shooting the same day that 1Ds3 was out and it worked just fine even tho the back wheel kept freezing up from my breath and snot I have to say my 5D has been great in unfriendly circumstances from cold to wet to dusty. The results from that 1ds3 are certainly strange. Let's just hope those results are not indicative of how all/most of the 1ds3 behave in very cold weather. I had an email from John, the owner of the 1ds3, today and the camera is back to being its happy self now that the weather has warmed up.
You know, I wouldn't rule out the CF card in this case. Those photos look an awful lot like shots I have seen from cards that were failing--it's happened to me once or twice now. The cards also have temp specs, and in this case, you are trying to write out one file quite rapidly after another, so I could see where the card might come into play. Anyway, another variable to toss out there.
That blue in that one sky makes me wonder, even though I think this is a real long shot--is there any possibility that you've got auto white balance set and the camera is returning loonie-tunes white balance/tint estimates?
Went outside this morning to take some pictures when it was in the -30F range. Luckily, there was next to no wind, so it wasn't too bad for the 10 or so minutes I was out there.
jhapeman wrote:
You know, I wouldn't rule out the CF card in this case. Those photos look an awful lot like shots I have seen from cards that were failing--it's happened to me once or twice now. The cards also have temp specs, and in this case, you are trying to write out one file quite rapidly after another, so I could see where the card might come into play. Anyway, another variable to toss out there.
Jeff
Hi Jeff,
Yep, I asked about the CF card/s he was using and it happened on 2 different cards. Not sure if he was also writing to the SD card too tho. I can check. That'd be a way to double check the CFcard performance.
Joe Decker wrote:
That blue in that one sky makes me wonder, even though I think this is a real long shot--is there any possibility that you've got auto white balance set and the camera is returning loonie-tunes white balance/tint estimates?
Joe, Thanks but John uses manual white balance so that's not the culprit.
I have to say my 5D has been great in unfriendly circumstances from cold to wet to dusty. The results from that 1ds3 are certainly strange. Let's just hope those results are not indicative of how all/most of the 1ds3 behave in very cold weather. I had an email from John, the owner of the 1ds3, today and the camera is back to being its happy self now that the weather has warmed up.