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Photo Forum / Digital Photography / DSLR Cameras / September 200610,000 ISO?
Possibly a back-thinned, illuminated CCD?? http://www.roundshot.ch/xml_1/internet/de/application/d438/d925/f934.cfm This scan back 6x17 camera is extremely fast. The image results are comparable to a one-shot digital or film back. This is possible thanks to a very high read-out speed of 300 MB per second - 100x faster than for any existing scan back. The fastest exposure speed is 1/20'000 - or one second for the entire 6x17 scan at full resolution! Compared to previous surface sensors, the sensitivity of the Seitz D3 sensor is significantly higher. Or compared to conventional scanning cameras, the sensitivity is increased by factor 100. This results in a very broad ISO/ASA range (equivalent) of 500 to 10,000, > Possibly a back-thinned, illuminated CCD?? From a thick-skinned obsessive NG poster. Your point? Other than to try to post something idiotic at least several times a week? >> Possibly a back-thinned, illuminated CCD?? >> > From a thick-skinned obsessive NG poster. > > Your point? Other than to try to post something idiotic at least several > times a week? I think this is almost a valid question, not well asked but can't have everything. Really Rich, ISO10,000 is not that high, some of todays D-SLR cameras will do ISO 6,400 so it is not even a whole factor higher, just means that it resolves a little better in the poorly lit scenes, just a little, you might find that with a bit of playing around on camera and in post you might almost mastch ISO10,000 if you are very careful. > >> Possibly a back-thinned, illuminated CCD?? > >> [quoted text clipped - 11 lines] > find that with a bit of playing around on camera and in post you might > almost mastch ISO10,000 if you are very careful. You can squeeze detail out of an image at 200,000 ISO, but It isn't like what 400 ISO looks like. I think the implication is that this camera holds 10,000 ISO and presents it like 1600-3200 ISO on a regular DSLR. If so, it's impressive for what it is. >>>> Possibly a back-thinned, illuminated CCD?? >>>> [quoted text clipped - 19 lines] > like 1600-3200 ISO on a regular DSLR. If so, it's impressive for what > it is. Canon or Nikon could easily do 10,000...but that doesn't mean it's going to impress. They've stopped at 3200 because that's as far as they are willing to consider "acceptable." Pushing higher is easy. It's just not very pretty...yet.  SignatureImages (Plus Snaps & Grabs) by Mark² at: www.pbase.com/markuson SignatureEd Smith"Why do drive-up ATM's have instructions in braille ?" RichA wrote: > Pete D wrote: >>> [quoted text clipped - 21 lines] > like 1600-3200 ISO on a regular DSLR. If so, it's impressive for what > it is. Canon or Nikon could easily do 10,000...but that doesn't mean it's going to impress. They've stopped at 3200 because that's as far as they are willing to consider "acceptable." Pushing higher is easy. It's just not very pretty...yet. SignatureImages (Plus Snaps & Grabs) by Mark² at: www.pbase.com/markuson Does it bother you Rich, that this camera is made of plastic? > Possibly a back-thinned, illuminated CCD?? > [quoted text clipped - 10 lines] > cameras, the sensitivity is increased by factor 100. This results in a > very broad ISO/ASA range (equivalent) of 500 to 10,000, The sensor is a TDI: a time delay integration array, similar to that used on the Mars Reconnaissance Orbiter (MRO) in the HIRIS camera, about to start mapping operations. It is a CCD. A technical paper on the web site is at: http://vfm.dalsa.com/support/techpapers/00012-00_03-43_Tri-TDI_sensor_tech_paper.pdf It shows the quantum efficiency is similar to other CCDs, so similar to other digital cameras on the market. The specifications say 8-micron pixels (compared to 8.2 microns in the canon 1D mark II and 5D cameras). The read noise is 19 electrons (compared to ~4 electrons for the 1D Mark II), and the full well is 50,000 electrons (compared to the 80,000 for the 1D Mark II). An important concept is the unity gain ISO where 1 data number in the A/D converter = 1 electron. For 12-bit converters, the unity gain of the 1D mark II is ISO 1300, and from the above specs, the unity gain for the same bits of the 6x17 camera would be about the same. One can always up the gain, but you just amplify noise with no benefit (it actually decreases dynamic range). So the sensor appears to have no ISO advantage over traditional cameras. So iso 10,000 would be about the same as on a 1D Mark II or 5D. Nevertheless, it is a neat camera for those with money to burn! For more on unity gain ISO and related issues, see: Digital Cameras: Does Pixel Size Matter? Factors in Choosing a Digital Camera http://www.clarkvision.com/imagedetail/does.pixel.size.matter Roger >> Possibly a back-thinned, illuminated CCD?? >> [quoted text clipped - 30 lines] > Factors in Choosing a Digital Camera > http://www.clarkvision.com/imagedetail/does.pixel.size.matter Roger - thank goodness for someone who actually adds useful information to the issue, rather than trading insults. David SignatureDavid Littlewood >>> Possibly a back-thinned, illuminated CCD?? >>> [quoted text clipped - 36 lines] > > David David, Thank you. That's especially nice considering the holy war going on in r.p.d. Roger |
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