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I dont know about the viability of these fast newts, the secondary is 90mm which is 20% of the area of the primary. So the aperture is only 160mm useable, this makes it a f3.75. It also has 45% central obstruction. I think personally I would prefer the FSQ106 with reducer that gives f3.6, I know the focal length would be shorter but I think it would be the cheaper more reliable option.
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