The 200x magnification is only a concern with regard to the stability of the atmosphere. As eyepiece focal lengths get shorter trouble with merging is more likely to appear if the bino's are not in good alignment, though you're likely to be safe going down to about 10mm eyepieces. - potential merging problems are strictly related to the focal length of the eyepiece, not the magnification produced in a given telescope (afaik).
Note: binoviewers increase the focal ratio/length of a SCT due to the reduced distance between the mirrors needed to achieve focus with the extended light path through the bino's, so you might be operating at around 240x with the 15mm plossls.
As I sais in my PM Chris, I need a yes or no tonight as I don't want to keep the single eyepiece buyer waiting too long. Cheers, Tony.
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