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What is the key difference between this and the MM4 60 GA ED/45 Travelscope + HDF T 15-45x Eyepiece? Glass type (LD, SLD or ED) is not specified here. — 1 Answer

by Sharon, from CT, United States Asked on March 25, 2019

Name Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit
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Answered by Opticron, Manufacturer from United Kingdom, on May 26, 2022

The MM3 60 does not use ED glass in the objective lens element stack. That is the key optical difference. The MM4 is 100% made in Japan vs the MM3 being made in China so build quality and QC are generally better on MM4 as reflected in the price.

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