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I had a red dog finder which came with my dob it was ok but really had issues trying to see through it properly. After discussions here I decided to get a telrad, I made my own due cover using black cover off a plastic folder and some velcrow dots and bingo no more dew.
I did also go and buy a Right angle correct view finder scope from bintell which is great for sky hopping. The telefax really works well.
That's what works for me anyway, once you align your scope telrad and finder scope it's a breeze.
Good luck
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