Hi Brett,
don't buy a dew shield. I am assuming you are having trouble with dew on the secondary. If so, drill a hole in the secondary holding plate (take the secondary assembly apart before hand) and install a Kendrick dew heater into that space and then run a power line along the truss. Put a shroud over the truss and you are in business. I never have dew on the secondary now and I have my scopes in a very dewy site. See photo.
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