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"I'm not clear on one point. If the entire primary mirror is utilised by any eyepiece, why does the brightness of the field reduce at higher magnifications"
I was always under the impression that the field dims because the available light is being spread over a larger area within the field of view. An analogy being pouring some water (light) over a given area. Pour a litre over a square foot and it looks wet (bright), pour the same litre over an acre and it wont look as wet (bright).
Hope I haven't added to the confusion.
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