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Hi Micheal,
Some nice detail in this image, being colour blind is obviously going to be a problem with colour balance.
The dot that you are seeing will almost certainly be dust on the CCD. It will be microscopic. Your CCD will probably look clean but I think that is where the spot will be. I suggest you, very carefully, follow Mikes advice regarding cleaning the CCD. My DMK has a thin protective piece of glass across the chip which, on occasions, I very carefully clean and gently wipe with a lens tissue from an Orion lens cleaning kit. Definitely don't rub it. It is probably worth trying a jumbo blower first, this may work and then there would be no need to touch the CCD at all.
I would highly recommend to you Al Sheens most excellent "Al's Reticle" which you can down load from the resources link on IIS. This is a reticle overlay that you can position over your capture screen as an aid to positioning your target.
Regards
Trevor
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