On the Deconvolution tab

• Select Process. There are three options here: van Cittert, Lucy-Richardson (Fast) and Lucy-Richardson (Slow). Van Cittert is the best for planetary details, while L-R works best on deep-sky objects. It is worth experimenting on your images, but these are good starting points. For this image, select the van Cittert algorithm.

• Number of Iterations. Each of the deconvolution routines is iterative, meaning it gets applied over and over. Five to ten iterations usually work the best, but larger numbers can be very effective (if somewhat time-consuming) for some images. For this first run, set to a value of 16.

• Relaxation Parameter. This controls the damping of noise. For this first run leave it set at the default value of 0.1.

On the Settings tab:

• Display Iterations. Checking this box will allow you to monitor the progress of the deconvolution. During this process, a status box will be displayed which contains a Stop button. Clicking on this button will stop the deconvolution at the current number of iterations. This can be handy when you are not sure how many iterations you want it to execute. For this tutorial, make sure the Display Iterations box is checked.

• Process high-frequency components only. In general, deconvolution has its greatest effect on the high-frequency components of an image. Low-frequency parts can be removed from the image, the deconvolution applied to the high-frequency components that remain, and then the original low-frequency part can be re-combined with the result. For now leave this unchecked.

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