Lives in United Kingdom Hampshire, United Kingdom
Works as a Software Engineer
Has a website at
Joined on Feb 10, 2006
About me:

Cameras: Mamiya 645DF+ with Phase One P25+ and
Phase One 645DF with Kodak ProBack 645M
Mamiya AF 35mm f/3.5
Hartblei Digital 45mm f/3.5 Super-Rotator Tilt Shift
Schneider Kreuznach 80mm LS f/2.8
Mamiya 120mm f/4 Macro MF
Mamiya Sekor 80mm f/1.9
Mamiya Sekor 145mm f/4 Soft

Alexey.Danilchenko's recent activity

  • If you like me are the owner of aging Phase One Pnn/Pnn+ digital back and find your back started to produce more defective (hot, cold) pixels or the whole columns(rows - in native sensor ...
  • Re: Proback 645 which this thread is all about - what a load of nonsense. Non repairable - may be, but only if hardware goes wrong and usually that happens a lot earlier in ProBack life (the only ...
  • Replied in DxO Labs Info
    I was not referring to their statement - I was referring to yours  about good fit and impossible negative coefficient.
  • Replied in DxO Labs Info
    You are not confusing interpolation with extrapolation here ? Interpolation is only meaningful for the range of values being fit - outside of this range especially polynomial fittings of higher ...
  • For modern sensors - some older sensor's CFA were daylight balanced and depending on IR filter red channel can clip first in those (Kodak's own sensors used in their old cameras is a good example)
  • This is what Kodak cameras used in 2001-2004 to a degree. Their firmwares attempted to deduce the illuminant and after determining that used to tweak preset WB for that illuminant to some degree.
  • The sensitive plane is generaly within the sensor ceramic casing, to put it within the plane of existing camera you do need to lift it (and that effectively what glass does). Think of it this way ...
  • For modern glass (Schott for example) it is roughly 1/3 of the glass thickness. So true that tour glass surface of the sensor cover will never be a film plane - that would be slightly behind it. ...
  • A link then - The Effect of Inserting a Flat Glass Plate into the Optical Path Downstream from a Lens Hopefully that is not too complex.
  • Hey no problem. I am not Kodak engineer though - I rather picked up the software and limited hardware maintenance of SLRs and ProBacks a in 5-6 years ago (plenty of links here, on various raussian ...
  • They widened the film port to allow for sensor electronics taht makes it larger than 35mm frame. The IR filter itself protrudes just around 1/3mm above film plane. The film plane is set by the ...
  • Nothing special - they were mass produced with cover glass. Just as all other Kodak sensors. This is all in those sensor specs should anyone cares to find out instead of arguing here. I was not ...
  • Not sure why this is directed to me - I was not asking anything. I know all there is to know about sensor focal plane and positioning. Probacks use  KAF-16801CE sensor which itself comes with ...
  • And where above I said it is not possible? I said it is not possible in a way CMOS does it with any substantial FPS and without closing shutter (S5 Pro if I recall correctly has about 10-15 FPS ...
  • CCD needs a global sensor reset before/after reading, and you cannot read constantly like CMOS simply because each line charge transfer will pick up additional exposure so you end up with garbage ...
  • This is just so not true. Otherwise no digital backs would be usable on film cameras like Contax 645 and Mamiya 645 AFD. Or even SLR/n where sensor with the IR filter sits in the film plane. Sensor ...
  • The swing could be as much as 30V in some cases - generating that from standard CMOS clock signals could be a bit involved. See here for example of former Kodak sensor . The schematics for some ...
  • CMOS don't in vast majority have ADC on each pixel. They have active pixel structure with transistors - e.q. this: The consumption is there for CCD because vast majority of them require large ...
  • That's not quite true. CCD consume more power during readouts generally but not during exposure. Of course they all different but Kodak KAF large sensors are known to be quite efficient and quiet ...
  • 14n is also CMOS sensor from FillFactory. People find all kind of crazy superstition to believe in - it does not make it true.
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