I had a look this morning at the internals and we're both thinking along the same lines netwolf and Omaroo. The (plastic) focuser tube has a chrome coating and the inside of the tube is still plain white PVC. I'll have a look in the hardware shop later for some sort of flat black paint. The internal baffles also occured to me, but will try the paint first.
Cheers
Glenhuon
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