> It is especially visible when the scene being photographed is
> naturally weak in the blue channel such as tungsten or street
> lighting. If you try to adjust the w/b to get realistic colours the
> banding will show up. This sort of scenario is pretty extreme so in
> practice it is not a severe limitation but imho it should be fixed.
>
> Regards
>
> Patrick
>
> On 1/22/07, David Savage <[EMAIL PROTECTED]> wrote:
>> I can't answer your question Patrick as I haven't installed it, but
>> speaking of banding.
>>
>> Is it possible that banding could be an issue when the battery is
>> nearly depleted?
>>
Possible theory for banding related to battery life:
Sensor noise is due (at least in part) to random thermal noise
associated with the temperature of the photosite. Astro-photographers
often cool their sensors with Peltier or liquid nitrogen to reduce the
sensor temperature.
Banding would tend to indicate some sort of *systemic* noise
generation. Possibly "hot spots" in the camera or sensor. I remember
seeing a link to some photos to a DSLR (Nikon 10Mp IIRC) where there was a
lot of noise in the corner of an image. Most likely a part of the camera
that got warmer than the rest and produced more sensor noise.
A dead/dying battery might be so because of use... and that use
could be making warm areas within the camera.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
