As I imaged an interesting area of detail between the craters Plana & Mason, where an apparent 'X' could be seen under the particular lighting conditions, I thought it gave a nice demonstration of the edge diffraction effect, that affects so many lunar and planetary images. I advocate imaging in colour (RGB) or using the individual colour filters like Green to minimise these diffraction effects. Many believe they get a better result with IR because it is less affected  by the seeing. Whilst that is true, you can wait for good seeing, but you cannot make the diffraction effect go away and in fact the effect is worse the better the seeing ,because the edges & boundaries are harder.

One manifestion of the effect is a light coloured ring, inside the darker area of the crater in shadow and I point this out in the example images. 

The primary image is the IR 642nm BP image and the mouse over is through the Green filter. Here you can see how much less of a diffraction effect there is with the reen image. Revisions C & D show the Red and Blue filter images respectively, where again the difference can be appreciated. I tried to show this with an animation, but the resolutuon is degraded too much to allow the difference to be clearly seen.

The other interesting feature of these images, is they show the deconvolution effect of applying Russel Croman's BlurXTerminator to a lunar image. As you may know, here is much excitement in the deep sky imaigng community about the application of this new process available within PixInsight. It produces deconvolution without the noise and artefacts created by most, if not all of the other processes we traditionally employ. I was interested to see how well it performed for lunar. It seems to be able to tailor the sharpening effect depending on how blurry the original image was. Compare the Blue and Red images.

Overall I was very impressed.