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Binoviewing is pretty awesome, huh? I was going to get the WOs too from Frontier Optics, until Daniel warned me that there is a good chance they will not work in my scope. So I reluctantly bought the Burgess unit from the States in the end, but I've learnt since that you can buy different OCAs separately. You can also by a 1.25" barrel extension to go between the BV and the WO 1.6x OCA to help reach focus. You can also use a large 2" barlow to get focus, but you will end up magnifying a lot more than 2x with a 2x barlow, so it's only good for high power viewing.
PS. OCA is a barlow-like lens that screws on the end of the binoviewer barrel. It pulls the focal plane forward to compensate for the added light path in the BV, and magnifies the image at the same time.
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