General Images

Sagittarius, 50 mm F/5.6 2 min ISO800, taken by Dave Brock

Southern Cross, 50mm F/2.8 lens, ISO800 taken by Dave Brock

Southern Cross, 70mm F/4 4 min, ISO800 taken by Dave Brock

Omega Centauri with satellite trail, Meade 14” with focal reducer F/6.3 30 sec, ISO1600 taken by Dave Brock

Centaurus A galaxy Meade 14” with focal reducer F/6.3 61 sec, ISO800 taken by Dave Brock

Orion nebula HAS 24” , F/14 30 sec, taken by Dave Brock

Orion nebula HAS 24” with focal reducer, F/8.8 30 sec, taken by Dave Brock

Orion nebula Meade 14” with focal reducer, F/6.3 30 sec, ISO800 taken by Dave Brock

47 Tucanae globular cluster Meade 14” with focal reducer, F/6.3 30 sec, taken by Dave Brock

Lens test, 350mm F/3.5, 302 sec, ISO800, Camera mounted on side of HAS 24”

Spectral Calibration

DSLR Camera Calibration

The spectral response of each pixel of a DSLR varies from pixel to pixel, even within pixels with the same filter. A means of calibrating the relative and absolute spectral response for each filter is desirable. To facilitate such calibration a monochromator whose output is coupled to an integrating sphere will be used to produce a uniform light source of known wavelength and bandwidth. A calibrated detector located at an integrating sphere port can be used to monitor the intensity of the illumination at the sphere wall whilst the image sensor under test views the sphere interior via an exit port. Once the spectral response of an image sensor is known it can be used to correct the results of stellar photometric measurements on images captured by the sensor.

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