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G'day Rob,
One of the guys at the Pony Club had a shield on his Dob. But he had it there to improve the contrast. I am going to make one up for mine as well and see if the contrast improves. With the secondary heater working, I have never had a dew problem, even with moisture dripping off the tube. You might as well build one, I figure every little thing you do improves the performance.
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