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the GSO 25-plossl field stop is 19.5mm, so should be OK, but if using with the C8 id still prob go for the 32mm plossl -even though the field stop is outside the aperture of the bino & some vignetting will reslt the lower magnification will be a benefit for the visual experience
i guess what im saying it doesnt make sense in theory but in practice id prefer the 32mm
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