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I was doing a bit of Googling and found this discussion on my 'Carey Mask'.
As far as I can make out, poor viewing conditions have not been a problem. Massive scintillation will make the spikes wider, but I can see no reason for the relative positions of them to change.
To be effective the mask needs to be cut from a thin sheet. My most successful version so far is laser cut from paper card, 1.9mm thick. This is to ensure elongated spikes. 1mm or even thinner would be ideal.
If anyone is interested and has access to a laser cutter I can supply a DXF file which can be scaled to suit your 'scope.
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