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Excessive Noise Issue with 1600mm during last capture
Hi everyone and Merry Xmas!
I have been using a 1600mm camera for many years with no inherent problems using a CDK 10" telescope. It's produced very fine images which are generally low noise.
However, for a second time, I have obtained images which are very noisy, especially in the RGB channels, most recently on M78. Although the nights were warmer, I did not think they were that warm, and I have not changed any setting with the camera (-20 degrees temp, 75 gain, 180" second exposures). The only other thing is that I have left the dew heater on.
Have tried stacking different darks to see if this was the cause and this has not made a difference.
As per the attached images, compared to the Cone Nebula, you can clearly see that the images are very noisy.
Anyone else experiencing this and the cause? Is it simply a function of ambient temperature being high as the nights were warm and I left the dew heater strap on?
Have a safe Xmas everyone!
John K.
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