Mirror camera lenses are better quality than most people think. That are difficult to use for the beginner photographer because they must be used completely in manual mode , nothing is automatic except the exposure in some cases , the f stop is fixed this one for example is f8, A although mirror lenses are difficult to use they are a very good cheap altrnative to expensive telephoto lenses.
Any telephoto lens is difficult to hold steady and mirror lenses are no exception, a tripod is by far the best answer.

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