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5mm equals 240x in your 8" f6 dob. This is high power that you may not be able to use very often depending on your seeing conditions at the time. If you are not really interested in planetary and want wide field views you may be better served with a 10mm Pentax XW or 9 or 11mm Nagler and a top quality 2x barlow. If you really want a 5mm with the widest field then go for the 5mm Nagler, 5mm Pentax XW or 6mm Ethos. Pentax has the best eye relief.
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