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Marc,
I do - that's the thing. Minimum of 6, usually 10. I really think the sensor face MUST be cleaned, as I can even see bi-axial diffraction spikes on some bright stars near the field edge (where there is a smallish mote that seems to split the light somewhat like a hair would)
I have used my camera mini-vac in there a few times, and used the UHTC cleaning fluid - as I said, some improvement, but still apparent. The objective front and rear on my FL102 is perfectly clean, and there are NO other glass elements in the train after the objective (rarely if ever use a flattener with this scope)
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