Re: 6mm vs 8mm
I also would be torn between the two. I have an AD12 also f/4.7 and use my ES 6.7mm 82 and it works great. I'm sure the 6mm would be good but I would be tempted for the 8mm which also would work very well, but there may be occasions when you could barlow the 8mm but likely never the 6mm.
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ACF 8"SCT,
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,
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120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
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&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.