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Hi Richard,
I have a 200mm Dob that came with a right angle finderscope that I found difficult to know exactly where I was aiming my scope in the sky.
I purchased a Four - Reticle Red Dot Viewfinder and find that it is a great asset when used in combination with my right angle finderscope.
You will find that you need to have it set to the lowest illumination setting.
I find that the circle / cross setting the best to use, as the Dot tends to blot out stars.
cheers, Ric.
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