This dew shield works. I recently started my equipment setup around 8:30 pm PST on an unusually warm night (90°F+) in northern CA. I ended my session around 2:30 am as temperatures dropped some 25°F and the dew point was 66°F. I was starting to get considerable amounts of condensation on my gear but the Astromania dew shield kept the meniscus on my Mak-Cas dew free. I am very satisfied with it's performance!
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