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So Raymo, hope you don't mind if I ask you one more question;
Are there really then, 2 kinds of barlows? Those designed for visual and those designed for photography? I mean I can't imagine a 5x would have much use visually. But even with a 2x, are some more designed for visual in terms of, say field flattening, or the number of elements or just general tolerances?
Cheers
Markus
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