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A spotting scope is really a telescope that produces an upright image. The major function of a spotting scope, like all telescopes, is to gather incoming light. The larger the diameter of the spotting scope’s objective lens, the more light it gathers, with more light translating into a brighter and better image. As the size of the objective lens increases, greater detail and clarity of image will be afforded.
Explanation: The usual English term is 'viewfinder', but because of the plural you may need either 'viewfinders' or 'binocular viewfinder' depending on the actual telescope. Do you have a picture which would clarify the issue