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hi rowland,
can't you keep the outside face free of condensation by adding an LP filter at the end of the T adaptor or nosepiece?
when I had the same issue with my QHY8 nosepiece, adding a coma corrector with a spacer in a dry bag kept condensation away and I didn't need a heater strap on the spacer as is normally done.
other option for a dslr would be an eos clip filter.
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