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- **[[Refractor Telescope]] ***[[Achromatic Refractor]]2 KB (176 words) - 09:58, 12 June 2019
- ...r to minimize the effects of chromatic aberration, while an [[apochromatic refractor]] can get away with shorter focal ratios since it uses special glass that d7 KB (1,162 words) - 17:38, 20 May 2019