In order to get professional images, you need to calibrate your raw images with a flat frame. In fact, your photographic system will produce an uneven response caused by:
Sensor inhomogeneous response (pixels that are more or less sensitive to light)
Optical vignetting (image is darker away from the centre)
Dust on the sensor window (seen as 'donut' shaped spots on the image)
To generate a flat frame, you need a homogeneous illuminated screen. Commercial LED panels are unsuitable for this task as they are excessively bright, often not dimmable and frequently have a colour dominance.
We stock Geoptik controllable flat field generators in a range of sizes to suit just about any telescope, as well as DayStar solar imaging Flat Caps.