Class #04: Calculation of read noise and gain

Following Howell (2006), Handbook of CCD Astronomy, Chapter 4.3

• Download the bias images bias1.fits and bias2.fits,
  as well as the flatfield images domeflat1.fits and domeflat2.fits.
  


• Determine the mean pixel value within each image.


• Create two difference images (bias1-bias2 and domeflat1-domeflat2). Measure the standard deviation of pixel values within each of them.


• How can you determine the gain from the above?
  (→ Lecture...)


• How can you derive the read noise from the gain and the measured values?
  (→ Lecture...)

Here's a solution:
gainread.cl