Hi HOrt
I forgot to mention above that your properly registered version of the sol 28 image above shows up a lot of interesting areas. The blue colour of some of the rocks and the fine dust looks almost exactly like the spirit images. The small spheroids look more like small berries now as compared with the just darker ones in mine.
Also, what I can't understand yet is why should the images from the 2 or 3 filters appear to be not blurred (or not blurred significantly) while the filter itself is is off by a few pixels. Should'nt settling affect the blurriness as well as the filters?
Winston