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Hi Vincent.
Great photos and well tracked. I like the lunar shot very much.
You could use images plus to remove the violet halos. This works pretty well.
In relation to filters - consider a UHCS filter which cuts out a little more of the blue halo than the semiapo (I have a semiapo filter also by the way). You will probably still get a little blue halo on bright stars with the semi apo. Alternatively a contrast booster (which I havent tried) might be ok for similar reasons - check out the transmission curves for these and UHCS if interested. The UHCS by the way doubles as a good light pollution filter for urban photography. You wont be missing your H beta, O3 or H alpha lines with this filter so should still be fine.
The semi apo filter however is great for visual (even better with a pale yellow series 4000 meade filter). I plan to try it with a bright yellow filter photographically and will post the results sometime. The UHCS is good for nebula but no so good for general visual.
Hope this helps.
An impressive entry into digital imaging with a lovely little petzval refractor.
Cheers
David
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