I made the mistake of buying 2 lens at about the 1800mm size. One is the 1780mm Nikkor and the other the Carl Zeiss Jena Apochromat Tessar 15/180cm (1800mm) Lens. One advantage the Zeiss has is the fact it is probably 40-50% smaller.
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| The Zeiss on the left, the Nikkor on the right |
