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Originally Posted by CoombellKid
Never yet seen a newt with a 25% obstruction, and I believe Most sct's CO is closer to 40%.
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Most Newts around have about 25% CO. The 8, 10 and 12" GSO Dobs (i.e. Newts) all have 25% CO. The 6" f/8 Dob looks like it has a bit less but I never measured it. 8" f/4 Newts have more, about 30% for mine, but that's a very fast scope. I did not realise most SCT's had such large COs.