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I am using 75/1000 Plano convex lens to build telescope. Can I use an achromatic focal reducer to reduce chromatic aberration?

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The focal reducer doesn't do that. In order to build an apochromatic refractor , that has minimal chromatic aberration, you need an objective lens assembly composed of 3 lenses. In order to reduce the spherical aberration and have a flat field, you need an additional lens element called field flattener. Hope this helps a bit

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