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I beleive that all reflectors (and many refractors) will need an OCS (Optical Corrector System) regardless of bino type to come to focus.
I've got the Denk "Big Easy" and it came with an OCS...different combinations of the OCS configuration allows different magnifications. It all works a treat.
I can't speak to the quality of the William's sets...I am pleased with my Denks.
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