Maybe more of a newbie telescope question rather than a PI question (so it is here in off-topic).
Both my images and my flats have some subtle defects that look like little copies
of my reflector's mirror around the outside (I count at least 6). The flat is mid-gray
but an extreme stretch in PI does show them up.
Any thoughts?
Both my images and my flats have some subtle defects that look like little copies
of my reflector's mirror around the outside (I count at least 6). The flat is mid-gray
but an extreme stretch in PI does show them up.
Any thoughts?
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