[Rex]

A twisted vane will just make a fairly thick vane optically - thus increasing the density of the spikes. Vanes that meet at the optical axis are closely double - the only 4 vane spider that will produce single spikes join as pairs on opposite sides of the spider hub which is a much stronger design anyway.

Thanks for the insite Mark. I had never noticed double spikes before so was wondering what the cause was. Not being 100% confident that collimation was spot on also put doubts in my mind I guess. Good to know its nothing to worry about. I will try to adjust things so as not to get them if I can coz I am not sure that I like them.

Nice image. I like the subtle colours.

I kinda like the double diffraction spikes too, but you only see them when zoomed in.

Must be pretty warm in Townsville, any idea of the temperature when you were imaging?

Thanks Tel, yes its very warm. Had a lot of noise in the image which took a bit of cleaning up. I just had a look at the raws and exif temp ranged from 30degrees when I started and the lowest was 26 for this run. Need to cool my camera lol. Just another thing to add to the list. I wonder if I will ever have an empty list? Maybe if I ever win lotto.