Which optical effect plagued early astronomical refracting telescopes despite lens crafting improvements?

💡 Explanation

When light passes through a refracting lens, chromatic aberration occurs because different wavelengths focus at slightly different points, leading to colored fringes and blurring despite polishing. Therefore chromatic aberration plagued early telescopes, rather than other aberrations which are caused by off-axis light or imperfect lens shaping.

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