RikM 2,583 Posted August 16, 2011 On this scope I am not sure. I have a little 150P and the secondary is very prone to dewing so I added a foam shield and it keeps it pretty much dew free. Same for my Skymax. I stuck one on the Dob just in case, it doesn't hurt and may help and I had the foam in the cupboard anyway, so it just seemed like a good idea. Link to comment
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