Location: Room A2, Conference Space, 2nd floor, New Student Centre
Most of the commercially available astronomical CCD cameras for the amateur astronomer incorporate an anti-blooming gate (ABG). It is widely accepted that the ABG introduces significant non-linearities and as a result these cameras are not recommended for astronomical photometry. Having two of these cameras, the SBIG ST2000XM and the QSI583ws, I investigated their non-linearities with a view to determining just how large the problem is and how it could be corrected. In response tests to a constant light source both cameras show a linearly decreasing flux (ADU/s) as a function of increasing signal. A quadratic function is fitted which corrects the non-linearities to a remaining non-linearity of <8ADU RMS from 0 to 55000ADU signal.