Quote:
Originally Posted by Gama
Greg, you have to understand noise of a CCD chip. "Noise" is random. If you get the same pattern, then you have NOT introduced any noise from the electronics.
If electronic noise was the main culprit, then its NOT predictable, as it can vary at any point and any temperature.
Cooling has a huge effect on sensor noise, this is why they use liquid nitrogen to cool the sensor, and not the whole camera
Even a -10 deg level is huge. Sbig darks, FLI Darks, etc, will have low noise as long as its cooling is great.
This is where FLI is a leader at. To get -65 Delta is a huge step, and remember what cools one side produces heat on the other.
Again, here is where you pay for you toy. It has to dissipate that heat without passing anything into the sensor side.
They dont make the cameras solid for no reason.
Theo
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You are quite right Theo, best to compare shots done at similar sensor temp but when you can go to 61.7C below ambient or better (best delta I have measured in daytime) -35C is so convenient as a year round temp setting...and you can see what it does. I must try a dark at the slower download speed and see what difference there might be..?
Yes the ProLine is a veritable brick, with three cooling fans blowing air over cooling vanes, to get these impressive cooling specs.
At the end of the day we take these darks for a reason so I guess as long as they match your lights accurately you can get good results regardless...just nice to know you have such great raw uncalibrated data to start with
...bluddy want to for a $10 000 camera
Mike