objective

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When English optician John Dollond introduced the achromatic objective lens in the mid-18th century, competitors came out with forged "Dolond" and "Dolland" telescopes in the hope of cashing in on the invention
Gamaleya independently developed the achromatic objective lens for refracting telescopes, an invention that historians in the West often attribute solely to the Englishmen Chester Moor Hall and John Dollond.
The achromatic objective lens was actually pretty good, but to really improve the scope's optical performance I had to replace the supplied second-rate high-power Huygenian eyepieces with coated Kellners.