Hi again..
I spoke to Sirius Optics the vendor from whom i purchased the scope originally and despite having been sold, the new owner kindly offerred to contact Lunt on my behalf and seek a replacement filter.
So fingers crossed that this happens soon.
Thanks all for your help. I just thougt it was always my lack of processing skills, but when i realised that even visual observation was laboursome i thought something might be wrong.
Thanks once again
John
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