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Darren, I actually haven't encountered that problem yet. Last winter was the first with my DSI II and I got some temps down to -8ºc, my problem was the corrector icing up before I made myself a dew shield.
Of the top of my head you could cover the filter slide with a cloth. A more annoying problem I find is that they do get dusty and require cleaning.
Later on down the track I will probably move to a filter wheel which will no doubt solve both problems.
Cheers
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